Orris

hey I got AP psych test it is on given stuff. I will give you topics. it should be direct and application based and it should be mixed. answer of each mcm should be different (either A,B,C,D). make mcq quiz. answer right below each question. eyes, The Visible Spectrum, Psychological Properties of Light (3), light wave length characterstic Brightness = amplitude Length = color, Refraction, Through the Eyes to the Brain, Structure of the EYE, Structure of the Eye: The Back, light's path in order, Light and Dark Adaptation, How the Eye Works (rods & cones), Peripheral Vision, Tunnel Vision, Blind Spot, Trichromatic Theory “Three-color Theory”, Opponent Process Theory, Afterimage, Problems With Vision Myopia (nearsightedness) - good near, bad far away. Hyperopia (farsightedness) - bad near, good far away. Astigmatism - irregularly shaped cornea, blurriness at any distance. Conjunctivitis (pink eye) Glaucoma - damage to optic nerve, destroys division. Color Blindness , Ears,Structure of the Ear, properties of sound, wave length, Hz, Amplitude (height) - decibels Volume (sound) - Loudness, Echo, Radar effect, Depth Perception, Conductive hearing loss - poor transfer of sounds from the tympanic membrane to the inner ear. Common as you get older. Nerve deafness - Damage to hair cells or the auditory nerve. Cochlear implant can help. Sensorineural hearing loss - damage to the inner ear, auditory nerve, or auditory processing areas of the brain. The loss of higher-pitched sounds., Cochlear Implant. Human Senses Sight - Vision Hear - Audition Smell - Olfaction Touch - Somesthetic Sense Taste - Gustation Balance - Vestibular Sense Movement - Kinesthetic Sense Smell & Taste together - Chemical Sense Taste: Anatomy of the Tongue Taste: Types (5) Taste Buds: receptors, responsible for sense of taste papillae. Gustation: Sensation of tastes Supertasters: people with particularly dense papillae-filled tongue. The ability to detect the level of the taste. Non-tasters: crave spicy & sweet foods. Olfaction (olfactory sense)- sense of smell. Olfactory - nerve fibers respond to gaseous molecules in a “lock & key” system. Olfactory bulbs - part of the brain located above sinus cavity & below frontal lobes Receives info from olfactory receptor cell (1000 receptors). Pheromones - airborne chemical signals that animals can perceive. Smell: Anatomy What is thought of as the sense of touch is really several sensations, originating in several different places in and on the body. Skin sense (touch, pressure, temp. pain) Proprioception (body in space) Taste Smell = Flavor, Homunculus. Kinesthetic sense:Sense of the location of body parts in relation to the ground and each other. Uses receptors from joints & limbs. Vestibular senses. Gate Control Theory of Pain Olfaction, Gustation, other senses, synesthesia, Absolute Threshold, Difference Threshold, Weber’s Law, Sensory Adaptation, Subliminal Perception, Inattentional Blindness, Change Blindness, The Art of Misdirection, Figure Ground, Proximity, Similarity, Continuity, Closure, Connectedness, Gestalt Grouping, Illusions, Phantom Limbs, difference between Top Down vs. Bottom Up Processing, inocular & Monocular Cues, Shape Constancy, Color Constancy & Lightness Constancy, Muller-lyer, Moon Illusion, 8 Monocular Cues.

Here's your AP Psych MCQ quiz — direct, application-based, and mixed across all your topics. Answers vary (A/B/C/D) throughout.

🧠 AP Psychology — Sensation & Perception Quiz

1. Maria stares at a bright red square for 30 seconds, then looks at a white wall. What does she see?
  • A) A red square
  • B) A green square
  • C) A blue square
  • D) Nothing — the image fades immediately
Answer: B — Afterimage. Opponent-process theory: the red-green channel fatigues, producing the opponent color (green) on the white surface.
2. A sound wave has a very high amplitude. This corresponds to which perceptual quality?
  • A) High pitch
  • B) Long wavelength
  • C) Loudness
  • D) Echo
Answer: C — Amplitude = decibels = loudness (volume).
3. Jake can read a book up close perfectly, but struggles to see the whiteboard across the room. His condition is:
  • A) Hyperopia
  • B) Astigmatism
  • C) Glaucoma
  • D) Myopia
Answer: D — Myopia (nearsightedness): good near, bad far.
4. Which structure in the eye is responsible for bending light to focus it onto the retina?
  • A) Iris
  • B) Cornea and lens
  • C) Fovea
  • D) Optic nerve
Answer: B — The cornea and lens refract (bend) incoming light.
5. The trichromatic theory proposes that color vision results from:
  • A) Opponent pairs of colors canceling each other out
  • B) Three types of cones sensitive to red, green, and blue
  • C) Rods responding to different wavelengths
  • D) The visual cortex assigning color after processing
Answer: B — Young-Helmholtz Trichromatic ("Three-color") Theory: red, green, blue cone types.
6. Sofia has damage to the hair cells in her cochlea. Which type of hearing loss does she have?
  • A) Conductive hearing loss
  • B) Tympanic membrane disorder
  • C) Nerve deafness / Sensorineural hearing loss
  • D) Echolocation impairment
Answer: C — Hair cell damage = sensorineural (nerve) hearing loss. A cochlear implant can help.
7. You walk into a dark movie theater from bright sunlight. The process that allows your eyes to adjust is:
  • A) Light adaptation
  • B) Refraction
  • C) Dark adaptation
  • D) Peripheral vision activation
Answer: C — Dark adaptation: rods gradually become more sensitive in low light.
8. According to Weber's Law, a weightlifter already holding 200 lbs would need how much additional weight to notice a difference if the JND is 2%?
  • A) 2 lbs
  • B) 4 lbs
  • C) 10 lbs
  • D) 20 lbs
Answer: B — 2% of 200 = 4 lbs. Weber's Law: JND is a constant proportion of the stimulus.
9. Which Gestalt principle explains why you perceive a dashed circle as a complete circle even though it has gaps?
  • A) Proximity
  • B) Similarity
  • C) Closure
  • D) Connectedness
Answer: C — Closure: the brain fills in missing information to perceive a complete form.
10. The part of the retina where the optic nerve exits, creating a region with no photoreceptors, is called the:
  • A) Fovea
  • B) Blind spot
  • C) Optic chiasm
  • D) Macula
Answer: B — The blind spot (optic disc) has no rods or cones.
11. A patient can only see objects directly in front of them and has lost all peripheral vision. This is consistent with:
  • A) Myopia
  • B) Color blindness
  • C) Glaucoma causing tunnel vision
  • D) Astigmatism
Answer: C — Glaucoma damages the optic nerve and typically destroys peripheral vision first, causing tunnel vision.
12. The olfactory bulbs receive information from approximately how many types of olfactory receptor cells?
  • A) 100
  • B) 500
  • C) 1,000
  • D) 10,000
Answer: C — ~1,000 olfactory receptor types, operating via a "lock and key" system.
13. During a magic show, the magician waves one hand dramatically while secretly switching cards with the other. The audience doesn't notice. This is best explained by:
  • A) Sensory adaptation
  • B) Inattentional blindness / The Art of Misdirection
  • C) Change blindness
  • D) Subliminal perception
Answer: B — Misdirection exploits inattentional blindness — focused attention on one thing causes you to miss another.
14. Which monocular depth cue is at work when railroad tracks appear to converge in the distance?
  • A) Interposition
  • B) Relative size
  • C) Linear perspective
  • D) Texture gradient
Answer: C — Linear perspective: parallel lines appear to converge at a vanishing point.
15. A person who experiences taste as colors or hears music as shapes has:
  • A) Olfactory agnosia
  • B) Synesthesia
  • C) Sensory adaptation
  • D) Phantom limb syndrome
Answer: B — Synesthesia: automatic blending of two or more senses.
16. Rods are to ________ as cones are to ________.
  • A) Color vision; black-and-white vision
  • B) Fovea; periphery
  • C) Dim light / peripheral vision; bright light / color / detail
  • D) Sound; light
Answer: C — Rods: dim light, peripheral. Cones: bright light, color, fine detail (concentrated in fovea).
17. The smallest detectable difference between two stimuli is called the:
  • A) Absolute threshold
  • B) Signal detection threshold
  • C) Difference threshold (JND)
  • D) Subliminal threshold
Answer: C — Just Noticeable Difference (JND) = difference threshold.
18. Pheromones are best described as:
  • A) Taste molecules detected by papillae
  • B) Airborne chemical signals detected by the olfactory system
  • C) Neurotransmitters released during smell
  • D) Hormones produced by the olfactory bulb
Answer: B — Pheromones: airborne chemical signals perceived by animals via olfaction.
19. The Müller-Lyer illusion (arrows pointing in vs. out on line ends) demonstrates that:
  • A) The brain uses binocular cues to judge depth
  • B) Top-down processing and learned depth cues distort size perception
  • C) Rods misinterpret linear perspective
  • D) Opponent-process theory fails in 3D environments
Answer: B — Top-down processing: cultural/learned experience with corners makes one line look longer.
20. Which structure vibrates first when sound waves enter the ear?
  • A) Cochlea
  • B) Oval window
  • C) Tympanic membrane (eardrum)
  • D) Auditory nerve
Answer: C — Sound path: outer ear → tympanic membrane → ossicles → oval window → cochlea → auditory nerve.
21. A supertaster differs from a non-taster primarily because supertasters:
  • A) Have fewer taste buds on their tongue
  • B) Crave spicy and sweet foods more intensely
  • C) Have a particularly dense concentration of papillae
  • D) Rely more on smell than taste
Answer: C — Supertasters have densely packed papillae, giving them heightened taste sensitivity.
22. The kinesthetic sense relies primarily on receptors located in the:
  • A) Inner ear (semicircular canals)
  • B) Olfactory bulb
  • C) Joints and limbs
  • D) Skin surface
Answer: C — Kinesthetic sense: joint and limb receptors track body part location/movement.
23. After holding ice for a while, your hand stops registering the cold as intensely. This is an example of:
  • A) Subliminal perception
  • B) Sensory adaptation
  • C) The gate control theory
  • D) Difference threshold
Answer: B — Sensory adaptation: reduced sensitivity to a constant, unchanging stimulus.
24. The gate control theory of pain proposes that:
  • A) Pain signals are blocked at the cochlea before reaching the brain
  • B) The spinal cord contains a "gate" that can be opened or closed to pain signals
  • C) Rods and cones regulate pain perception in bright light
  • D) Phantom limb pain is caused by cortical remapping
Answer: B — Gate Control Theory (Melzack & Wall): spinal cord gates can amplify or inhibit pain signals before they reach the brain.
25. You see a white piece of paper as white whether you're in bright sunlight or dim lamplight. This is called:
  • A) Shape constancy
  • B) Color blindness compensation
  • C) Lightness constancy
  • D) The Moon illusion
Answer: C — Lightness constancy: the brain perceives an object's reflectance as stable despite changes in illumination.
26. Which of the following is a binocular (two-eye) depth cue?
  • A) Linear perspective
  • B) Retinal disparity
  • C) Motion parallax
  • D) Interposition
Answer: B — Retinal disparity: the slightly different images from each eye are combined by the brain to calculate depth. (All others listed are monocular.)
27. A researcher flashes a word on a screen for 1 millisecond — below the absolute threshold. The participant denies seeing it but shows a slight response. This demonstrates:
  • A) Change blindness
  • B) Sensory adaptation
  • C) Subliminal perception
  • D) Inattentional blindness
Answer: C — Subliminal perception: stimuli below conscious awareness can still influence responses.
28. The vestibular sense primarily provides information about:
  • A) The location of limbs relative to each other
  • B) Taste intensity
  • C) Balance and spatial orientation relative to gravity
  • D) Detecting airborne chemicals
Answer: C — Vestibular sense: balance, head position, movement — using the semicircular canals and otolith organs in the inner ear.
29. A person watches a video of a man walking down a street. When a woman is substituted mid-clip without a cut, the person doesn't notice. This best illustrates:
  • A) Inattentional blindness
  • B) Change blindness
  • C) Sensory adaptation
  • D) Figure-ground confusion
Answer: B — Change blindness: failure to detect changes in a visual scene, especially across cuts or distractions.
30. Light with a shorter wavelength is perceived as which color?
  • A) Red
  • B) Orange
  • C) Yellow
  • D) Violet/Blue
Answer: D — Short wavelengths (~380–450 nm) = violet/blue. Long wavelengths (~620–750 nm) = red.
30 questions total. Here's a quick topic coverage map:
Topic AreaQuestions
Eye structure & light path4, 7, 10, 16
Color theories & afterimage1, 5, 30
Vision problems3, 11
Monocular & binocular cues14, 26
Ear structure & hearing20, 6
Sound properties2
Perception principles (Gestalt, constancy, illusions)9, 19, 25, 28
Thresholds & adaptation8, 17, 23, 27
Inattentional / change blindness13, 29
Smell & taste12, 18, 21
Other senses (kinesthetic, vestibular, pain)22, 24, 28
Synesthesia & misc.15
Weber's Law8
Good luck on the test! Let me know if you want more questions on any specific topic.

give more question cover every minor things and do the way I set up everything in my mind. do direct and application/senario based question and max no. of questions, all topics, mix, same format. quick revision/cheatsheet of all at end. hardest level question. AP psyc

🧠 AP Psychology — Sensation & Perception MASTER QUIZ

Hardest Level | Application & Scenario Based | All Topics

👁️ SECTION 1: THE EYE & VISION

1. Light enters your eye and is first bent (refracted) by the __________, then fine-tuned by the __________.
  • A) Lens; cornea
  • B) Pupil; iris
  • C) Cornea; lens
  • D) Retina; fovea
Answer: C — Cornea does the major refraction; the flexible lens fine-tunes focus.
2. Dr. Chen shines a flashlight into a patient's eye. The black circle shrinks immediately. Which structure is controlling this response?
  • A) Cornea
  • B) Lens
  • C) Retina
  • D) Iris
Answer: D — The iris (the colored ring) contracts or dilates the pupil to control light entry.
3. In the correct order, light travels through the eye via:
  • A) Cornea → Pupil → Lens → Vitreous humor → Retina → Optic nerve
  • B) Pupil → Cornea → Lens → Retina → Optic nerve
  • C) Cornea → Iris → Retina → Lens → Optic nerve
  • D) Lens → Cornea → Pupil → Retina → Optic nerve
Answer: A — Correct path: Cornea → Pupil → Lens → Vitreous humor → Retina → Optic nerve → Brain.
4. A concert photographer needs to shoot in near-darkness. Which photoreceptors are doing most of the work, and where are they most concentrated?
  • A) Cones; fovea
  • B) Rods; periphery of the retina
  • C) Cones; periphery
  • D) Rods; fovea
Answer: B — Rods are extremely light-sensitive and concentrated in the peripheral retina. Cones cluster at the fovea.
5. An astronomer trying to spot a faint star looks slightly to the side rather than directly at it. Why does this trick work?
  • A) The optic nerve is off-center so indirect viewing avoids the blind spot
  • B) The fovea has more rods than the periphery
  • C) The peripheral retina has more rods, which are more sensitive in dim light
  • D) The lens refracts light better off-axis
Answer: C — Off-center viewing hits the rod-rich periphery, improving dim-light detection.
6. A patient has damage specifically to their fovea. Which ability would be MOST impaired?
  • A) Seeing in dim light
  • B) Detecting motion in the periphery
  • C) Reading fine print
  • D) Night driving
Answer: C — The fovea is packed with cones responsible for high-acuity, color, and detail vision.
7. You walk from a dark movie theater into bright sunlight. Your eyes take only a few seconds to adjust. This faster adjustment is called:
  • A) Dark adaptation
  • B) Light adaptation
  • C) Sensory adaptation
  • D) Pupil dilation
Answer: B — Light adaptation is fast (seconds); dark adaptation is slow (up to 30 minutes).
8. During dark adaptation, which photoreceptors take longer to fully adapt and ultimately provide the most sensitivity?
  • A) Cones — they adapt in ~10 minutes
  • B) Rods — they fully adapt in ~30 minutes
  • C) Rods — they adapt in ~3 minutes
  • D) Cones — they adapt in ~30 minutes
Answer: B — Rods take ~20–30 minutes for full dark adaptation and are more sensitive than cones in the dark.
9. James covers one eye after a retinal exam and notices he cannot perceive depth as well. Which type of depth cue has he lost?
  • A) Monocular cues
  • B) Binocular cues (retinal disparity)
  • C) Motion parallax
  • D) Texture gradient
Answer: B — Covering one eye eliminates binocular/stereoscopic cues like retinal disparity and convergence.
10. Which of the following correctly describes the blind spot?
  • A) The area of sharpest vision due to dense cone packing
  • B) The region where the optic nerve exits the retina, containing no photoreceptors
  • C) A zone of only rod photoreceptors at the retina's edge
  • D) The result of damage to the fovea
Answer: B — The optic disc (blind spot): no rods or cones, so no visual information is processed there.
11. A patient reports losing their peripheral vision progressively over years, now seeing as if through a narrow tube. This is classic for:
  • A) Myopia
  • B) Macular degeneration
  • C) Glaucoma (tunnel vision)
  • D) Color blindness
Answer: C — Glaucoma damages the optic nerve, characteristically destroying peripheral vision first → tunnel vision.
12. Which vision problem involves an irregularly shaped cornea that causes blurry vision at ALL distances?
  • A) Myopia
  • B) Hyperopia
  • C) Glaucoma
  • D) Astigmatism
Answer: D — Astigmatism: irregular cornea curvature → distorted/blurry vision at any distance.
13. Tyler can read his phone perfectly but can't see faces across a room without squinting. His older brother needs reading glasses but drives fine without them. Which conditions do they have, respectively?
  • A) Tyler: hyperopia; brother: myopia
  • B) Tyler: astigmatism; brother: hyperopia
  • C) Tyler: myopia; brother: hyperopia
  • D) Tyler: myopia; brother: astigmatism
Answer: C — Myopia = good near/bad far; Hyperopia = bad near/good far.
14. A child comes to school with a red, itchy, sticky eye. The teacher suspects:
  • A) Glaucoma
  • B) Conjunctivitis (pink eye)
  • C) Astigmatism
  • D) Detached retina
Answer: B — Conjunctivitis (pink eye): inflammation of the conjunctiva, highly contagious, causes red/itchy/discharge.

🌈 SECTION 2: COLOR VISION THEORIES & PROBLEMS

15. The trichromatic theory best explains color vision at the level of the __________, while opponent-process theory best explains what happens at the level of the __________.
  • A) Retinal ganglion cells; cones
  • B) Cones; retinal ganglion cells and beyond
  • C) Optic nerve; cornea
  • D) Brain; rods
Answer: B — Both theories are correct at different stages: trichromatic at receptor level, opponent-process at ganglion/brain level.
16. A man can't distinguish red from green traffic lights. He likely has:
  • A) Blue-yellow color blindness
  • B) Complete achromatopsia
  • C) Red-green color blindness (most common form)
  • D) Astigmatism
Answer: C — Red-green color blindness is the most common type, X-linked recessive, far more common in males.
17. According to opponent-process theory, which color pairs are "opponents"?
  • A) Red-orange, Blue-violet, Green-yellow
  • B) Red-green, Blue-yellow, Black-white
  • C) Red-blue, Green-yellow, Black-orange
  • D) Red-yellow, Blue-green, Black-gray
Answer: B — Opponent pairs: Red↔Green, Blue↔Yellow, Black↔White.
18. After staring at a green circle for 30 seconds, Nina looks at a blank white wall. What does she see, and why?
  • A) A green circle; the green cones remain activated
  • B) A red circle; the fatigued green channel triggers its opponent (red)
  • C) A blue circle; the color wheel shifts one step
  • D) Nothing; the image fully dissipates
Answer: B — Afterimage: fatigue in green-sensitive pathways causes opponent red to dominate on the neutral background.
19. The visible spectrum of light that humans can perceive ranges approximately from:
  • A) 200–500 nm
  • B) 380–700 nm
  • C) 500–900 nm
  • D) 100–380 nm
Answer: B — Visible spectrum: ~380 nm (violet) to ~700 nm (red).
20. A light wave with HIGH amplitude and SHORT wavelength would be perceived as:
  • A) Dim and red
  • B) Bright and violet/blue
  • C) Dim and blue
  • D) Bright and red
Answer: B — High amplitude = bright; short wavelength = violet/blue end of spectrum.

👂 SECTION 3: THE EAR & HEARING

21. In the correct order, sound waves travel through the ear via:
  • A) Tympanic membrane → Ossicles → Oval window → Cochlea → Auditory nerve
  • B) Cochlea → Ossicles → Tympanic membrane → Auditory nerve
  • C) Oval window → Tympanic membrane → Cochlea → Ossicles
  • D) Tympanic membrane → Cochlea → Ossicles → Auditory nerve
Answer: A — Outer ear → eardrum (tympanic membrane) → 3 ossicles (malleus, incus, stapes) → oval window → cochlea → auditory nerve → brain.
22. The three small bones that amplify and transmit vibrations in the middle ear are called:
  • A) Semicircular canals
  • B) Ossicles (malleus, incus, stapes)
  • C) Cochlea and vestibule
  • D) Otolith organs
Answer: B — The ossicles (hammer, anvil, stirrup) = the three smallest bones in the human body.
23. A musician has been playing loud concerts without ear protection for 20 years. An audiologist finds damage to the hair cells in the cochlea. This is classified as:
  • A) Conductive hearing loss
  • B) Sensorineural hearing loss / nerve deafness
  • C) Otitis media
  • D) Tympanic perforation
Answer: B — Cochlear hair cell damage = sensorineural (nerve) deafness. A cochlear implant may help.
24. An elderly patient's audiogram shows poor sound conduction from the eardrum to the inner ear, but inner ear function is intact. This describes:
  • A) Sensorineural hearing loss
  • B) Nerve deafness
  • C) Conductive hearing loss
  • D) Auditory processing disorder
Answer: C — Conductive hearing loss: poor transfer from tympanic membrane to inner ear. Common with age.
25. A cochlear implant bypasses damaged hair cells and directly stimulates which structure?
  • A) Tympanic membrane
  • B) Ossicles
  • C) Auditory nerve
  • D) Semicircular canals
Answer: C — Cochlear implants convert sound to electrical signals sent directly to the auditory nerve.
26. A sound wave has a frequency of 20 Hz. This would be perceived as:
  • A) Very high-pitched
  • B) Very loud
  • C) Very low-pitched (barely audible)
  • D) An ultrasound
Answer: C — Hz = frequency = pitch. 20 Hz is the lowest limit of human hearing. Lower Hz = lower pitch.
27. Sensorineural hearing loss specifically causes loss of which frequencies first?
  • A) Low-pitched sounds
  • B) Mid-range frequencies
  • C) Higher-pitched sounds
  • D) All frequencies equally
Answer: C — Sensorineural hearing loss preferentially affects high-frequency (high-pitched) sounds first.
28. A bat emits a sound that bounces off an insect and returns. The bat uses this to locate prey. This is called:
  • A) Echo
  • B) Radar/echolocation effect
  • C) Amplitude modulation
  • D) Vestibular mapping
Answer: B — Echolocation (radar effect): using reflected sound waves to detect objects/distance.

🫀 SECTION 4: ALL HUMAN SENSES

29. A wine sommelier swirls a glass, inhales deeply, and then takes a sip. The rich "flavor" they detect is a combination of:
  • A) Gustation and vestibular sense
  • B) Olfaction and gustation (chemical sense)
  • C) Somesthetic and olfactory senses
  • D) Kinesthetic and taste senses
Answer: B — Flavor = taste (gustation) + smell (olfaction) together = chemical sense.
30. Which of the 5 basic taste types was added most recently to the classic four?
  • A) Sour
  • B) Bitter
  • C) Umami (savory)
  • D) Sweet
Answer: C — The 5 tastes: sweet, sour, salty, bitter, and umami (savory/meaty) — umami was the most recently recognized.
31. Jasmine has an unusually high density of papillae on her tongue and finds black coffee unbearably bitter. She is most likely a:
  • A) Non-taster
  • B) Supertaster
  • C) Gustatory agnosic
  • D) Hyposmic individual
Answer: B — Supertasters: dense papillae → heightened taste sensitivity, especially to bitter flavors.
32. Carlos craves spicy wings and extra-sweet soda more than his friends. He likely has:
  • A) More taste buds and is a supertaster
  • B) Fewer papillae and is a non-taster
  • C) Hyperactive olfactory receptors
  • D) Damage to umami receptors
Answer: B — Non-tasters have fewer papillae/taste buds → less taste sensitivity → crave intense (spicy/sweet) flavors.
33. The "lock and key" system refers to which sensory process?
  • A) The way taste buds bind to food molecules
  • B) How olfactory receptor cells bind to specific odor molecules
  • C) How hair cells in the cochlea detect specific frequencies
  • D) How cones respond to specific wavelengths
Answer: B — Olfactory receptors operate on a lock-and-key model: specific odor molecules (keys) fit specific receptor shapes (locks).
34. The olfactory bulbs are located:
  • A) Inside the cochlea, near the hair cells
  • B) Above the sinus cavity and below the frontal lobes
  • C) On the surface of the tongue near taste buds
  • D) In the brainstem's reticular formation
Answer: B — Olfactory bulbs sit just above the sinuses, below the frontal lobes, receiving signals from ~1,000 olfactory receptor types.
35. Male dogs can detect a female in heat from miles away. This is an example of:
  • A) Olfactory adaptation
  • B) Pheromone detection
  • C) Gustatory signaling
  • D) Vestibular acuity
Answer: B — Pheromones: airborne chemical signals that convey reproductive and social information.
36. A gymnast on a balance beam knows where her arms and legs are without looking at them. This relies on:
  • A) Vestibular sense
  • B) Somesthetic sense
  • C) Kinesthetic sense
  • D) Proprioceptive cortex activation only
Answer: C — Kinesthetic sense: awareness of body part location/movement using joint and limb receptors.
37. A person on a spinning carnival ride becomes dizzy because of fluid movement in the:
  • A) Cochlea
  • B) Semicircular canals (vestibular system)
  • C) Otolith organs only
  • D) Tympanic membrane
Answer: B — Semicircular canals detect rotational movement; fluid shifts signal the brain about spinning.
38. The homunculus map in the somatosensory cortex shows that the hands and lips take up a disproportionately large area. This reflects:
  • A) Those areas have more muscle mass
  • B) Greater density of sensory receptors requiring more cortical processing
  • C) The visual cortex's overlap with motor areas
  • D) The kinesthetic sense's prioritization of extremities
Answer: B — Cortical real estate = receptor density. Lips and hands are exquisitely sensitive → large cortical representation.
39. After losing his arm in an accident, Malik reports feeling pain in his missing hand. This is called:
  • A) Referred pain
  • B) Phantom limb pain
  • C) Gate control activation
  • D) Somesthetic displacement
Answer: B — Phantom limb: the brain continues to map and receive signals from the cortical region representing the lost limb.
40. According to gate control theory, why might rubbing a bumped elbow reduce pain?
  • A) Rubbing activates opponent-process signals
  • B) Large nerve fibers activated by touch "close the gate" to pain signals in the spinal cord
  • C) It triggers endorphin release in the amygdala
  • D) Sensory adaptation eliminates the pain receptor entirely
Answer: B — Gate Control Theory: touch/pressure activates large-diameter nerve fibers that close the spinal "gate," reducing pain signal transmission to the brain.

🧩 SECTION 5: THRESHOLDS, ADAPTATION & SUBLIMINAL

41. The minimum stimulus intensity needed for a person to detect it 50% of the time is the:
  • A) Difference threshold
  • B) Weber fraction
  • C) Absolute threshold
  • D) Sensory adaptation point
Answer: C — Absolute threshold: the weakest stimulus detectable 50% of the time.
42. A candle flame can be seen on a clear dark night at 30 miles. This is an example of:
  • A) The difference threshold
  • B) Weber's Law in action
  • C) The absolute threshold for vision
  • D) Subliminal perception
Answer: C — This is a classic textbook example illustrating the absolute threshold for human vision.
43. A perfume company adds 10% more fragrance to their product. According to Weber's Law, whether customers notice the change depends on:
  • A) The absolute threshold for smell
  • B) The original concentration — the JND is a fixed proportion of the original stimulus
  • C) How many olfactory receptors the customer has
  • D) The molecular weight of the fragrance molecules
Answer: B — Weber's Law: the JND is always a constant proportion (Weber fraction) of the original stimulus, not a fixed absolute amount.
44. You've been sitting next to a fish tank for an hour and no longer smell the water. This illustrates:
  • A) Difference threshold elevation
  • B) Sensory adaptation
  • C) Subliminal olfactory processing
  • D) Olfactory agnosia
Answer: B — Sensory adaptation: decreased sensitivity to a constant, unchanging stimulus over time.
45. A movie theater secretly flashes "Drink Coca-Cola" for 1/300th of a second between frames. This is an example of:
  • A) Inattentional blindness
  • B) Sensory adaptation
  • C) Subliminal perception
  • D) Change blindness
Answer: C — Subliminal perception: stimuli presented below conscious awareness that may (weakly) influence behavior.
46. A radiologist focuses intensely on a lung X-ray looking for nodules. Later, it's revealed a small surgical instrument was also visible on the X-ray but the radiologist didn't notice it. This is:
  • A) Change blindness
  • B) Inattentional blindness
  • C) Sensory adaptation
  • D) Subliminal perception
Answer: B — Inattentional blindness: when focused attention on one task causes us to miss other, unattended stimuli.
47. In a famous experiment, participants watching a basketball video didn't notice a person in a gorilla suit. This demonstrates:
  • A) Change blindness
  • B) The cocktail party effect
  • C) Inattentional blindness
  • D) Misdirection
Answer: C — Classic inattentional blindness (Simons & Chabris gorilla study).
48. A film editor watches the same scene twice. In the second version, the actor's shirt color has changed. She doesn't notice. This is:
  • A) Inattentional blindness
  • B) Sensory adaptation
  • C) Change blindness
  • D) Subliminal processing
Answer: C — Change blindness: failure to detect visible changes in a scene, especially across cuts/interruptions.

🎭 SECTION 6: GESTALT PRINCIPLES & PERCEPTION

49. You see dots arranged in two clusters on a page and perceive them as two distinct groups, not one random collection. This is:
  • A) Similarity
  • B) Proximity
  • C) Continuity
  • D) Connectedness
Answer: B — Proximity: objects near each other are grouped together perceptually.
50. A logo uses red circles and blue squares alternating in a row. You perceive two distinct lines — one of circles, one of squares. This is:
  • A) Closure
  • B) Proximity
  • C) Similarity
  • D) Continuity
Answer: C — Similarity: similar objects are grouped together.
51. When you look at a curved dotted line, you perceive it as a continuous arc rather than individual dots. This is:
  • A) Closure
  • B) Connectedness
  • C) Continuity
  • D) Figure-Ground
Answer: C — Continuity: the tendency to perceive smooth, continuous patterns rather than discontinuous ones.
52. In the FedEx logo, a hidden arrow appears between the E and x. Your brain fills in that shape using what Gestalt principle?
  • A) Proximity
  • B) Similarity
  • C) Closure
  • D) Connectedness
Answer: C — Closure: the brain fills in gaps to perceive a complete figure.
53. When you see a Dalmatian standing against a white background with snow, you can distinguish the dog from the background. This is:
  • A) Proximity
  • B) Figure-ground perception
  • C) Closure
  • D) Top-down processing
Answer: B — Figure-ground: organizing the visual field into a figure (object of focus) and ground (background).
54. Which Gestalt principle is demonstrated when we perceive connected objects as a single unit even if they differ in shape, color, or size?
  • A) Similarity
  • B) Proximity
  • C) Closure
  • D) Connectedness
Answer: D — Connectedness: physically connected elements are perceived as a single unit.

🌀 SECTION 7: DEPTH PERCEPTION & MONOCULAR CUES

55. A researcher covers one of a newborn's eyes and presents a visual cliff. The infant shows no fear. When both eyes are uncovered, fear emerges. This suggests that __________ requires both eyes.
  • A) Motion parallax
  • B) Binocular disparity/stereopsis
  • C) Texture gradient
  • D) Interposition
Answer: B — Binocular disparity (retinal disparity) requires two eyes and is critical for depth perception.
56. As you drive down a highway, nearby fence posts rush past your window faster than distant mountains. This depth cue is called:
  • A) Linear perspective
  • B) Aerial perspective
  • C) Motion parallax
  • D) Relative size
Answer: C — Motion parallax: near objects appear to move faster across the visual field than distant objects.
57. In a painting, the artist makes the mountains slightly blurry and bluish-gray. This mimics which monocular depth cue?
  • A) Relative clarity
  • B) Aerial/atmospheric perspective
  • C) Texture gradient
  • D) Interposition
Answer: B — Aerial/atmospheric perspective: distant objects appear hazier and less saturated due to particles in the atmosphere.
58. A soldier hides behind a tree, blocking your view of them. You still know they're farther away than the tree. This cue is:
  • A) Relative size
  • B) Linear perspective
  • C) Interposition (overlap)
  • D) Motion parallax
Answer: C — Interposition: when one object partially blocks another, the blocking object is perceived as closer.
59. You compare two cars in a parking lot. One looks much smaller in your visual field, so you assume it's farther away. This cue is:
  • A) Texture gradient
  • B) Relative size
  • C) Aerial perspective
  • D) Convergence
Answer: B — Relative size: if two objects are assumed equal in size, the one with a smaller retinal image is perceived as farther.
60. As you walk through a tiled plaza, the tiles near your feet look large and distinct; those far away look smaller and more densely packed. This is:
  • A) Linear perspective
  • B) Relative clarity
  • C) Texture gradient
  • D) Relative height
Answer: C — Texture gradient: fine details become denser and less distinct with distance.
61. A buoy sitting low on the horizon appears farther away than one bobbing nearby. This cue uses:
  • A) Relative height (elevation in visual field)
  • B) Interposition
  • C) Motion parallax
  • D) Relative size
Answer: A — Relative height: objects higher in the visual field (closer to the horizon) are perceived as more distant.
62. Which of the following is a BINOCULAR (requires both eyes) cue to depth?
  • A) Texture gradient
  • B) Interposition
  • C) Convergence
  • D) Aerial perspective
Answer: C — Convergence: the brain senses the inward turning of the eyes for near objects as a depth signal. Requires two eyes.

🌕 SECTION 8: CONSTANCIES & ILLUSIONS

63. A door looks rectangular whether it's open at an angle or closed flat against the wall. This is:
  • A) Color constancy
  • B) Size constancy
  • C) Shape constancy
  • D) Lightness constancy
Answer: C — Shape constancy: we perceive an object's shape as stable even when its retinal image changes due to viewing angle.
64. The moon looks enormous on the horizon but tiny high in the sky, even though it's the same size. This is the:
  • A) Müller-Lyer illusion
  • B) Moon illusion
  • C) Ponzo illusion
  • D) Size constancy failure
Answer: B — Moon illusion: the horizon moon appears larger because surrounding cues (trees, buildings) trigger depth processing, making the brain scale it up.
65. In the Müller-Lyer illusion, two lines of equal length look different because of:
  • A) Different wavelengths of surrounding light
  • B) Arrows/fins at the ends acting as depth cues learned from experience with corners
  • C) Color contrast making one line appear shorter
  • D) Gestalt closure around one line
Answer: B — The fins create internalized "corner" depth cues (top-down processing from architectural experience), distorting perceived length.
66. You're wearing orange-tinted ski goggles all day. By afternoon, snow still looks white to you. This is:
  • A) Lightness constancy
  • B) Color constancy
  • C) Shape constancy
  • D) Sensory adaptation to wavelength
Answer: B — Color constancy: the brain adjusts for ambient lighting conditions to maintain stable color perception.

🔄 SECTION 9: TOP-DOWN vs. BOTTOM-UP PROCESSING

67. A radiologist with 20 years of experience spots a subtle tumor on an X-ray that a first-year student misses entirely. The expert is using:
  • A) Bottom-up processing — more sensory data
  • B) Top-down processing — prior knowledge guides perception
  • C) Subliminal perception
  • D) Inattentional blindness
Answer: B — Top-down processing: expectations, knowledge, and context shape perception.
68. A newborn baby stares at a checkerboard pattern for the first time and tracks the edges with its gaze. This is primarily:
  • A) Top-down processing
  • B) Learned perceptual set
  • C) Bottom-up processing
  • D) Gestalt perceptual grouping
Answer: C — Bottom-up processing: perception driven purely by incoming sensory data, without prior knowledge or expectations.
69. You're at a noisy party and suddenly hear your name from across the room — despite not "listening" for it. This shows:
  • A) Inattentional blindness
  • B) Top-down processing (cocktail party effect)
  • C) Subliminal auditory perception
  • D) Absolute threshold for audition
Answer: B — Cocktail party effect: top-down processing allows personally meaningful stimuli (your name) to break through background noise.

🎯 SECTION 10: MIXED HIGH-DIFFICULTY APPLICATION

70. A researcher finds that participants detect a faint light 50% of the time at 5 photons. This measurement represents:
  • A) The JND for vision
  • B) The Weber fraction for luminance
  • C) The absolute threshold for vision
  • D) The subliminal exposure level
Answer: C — Absolute threshold = minimum intensity detected 50% of the time.
71. A violinist notices when a piece is transposed by a half-step but can't detect a shift of 2 cents (a tiny microtonal change). The 2-cent shift falls below her:
  • A) Absolute threshold
  • B) Difference threshold (JND)
  • C) Sensory adaptation point
  • D) Weber fraction limit
Answer: B — The 2-cent shift is below her JND (just noticeable difference) for pitch.
72. Which theory of hearing proposes that different areas of the basilar membrane respond to different frequencies?
  • A) Trichromatic theory
  • B) Frequency theory
  • C) Place theory
  • D) Opponent-process theory
Answer: C — Place theory (Helmholtz): the location of vibration along the basilar membrane determines perceived pitch.
73. Tyler holds his hand under running cold water. Initially it's very cold, but after 2 minutes it barely feels cold anymore. This is:
  • A) Gate control
  • B) Difference threshold elevation
  • C) Sensory adaptation
  • D) Phantom sensation
Answer: C — Sensory adaptation: the constant stimulus (cold) causes reduced receptor sensitivity over time.
74. A patient with damage to their auditory nerve in one ear receives a cochlear implant. The implant works by:
  • A) Replacing the ossicles to improve conduction
  • B) Repairing damaged hair cells in the cochlea
  • C) Converting sound into electrical signals sent directly to the auditory nerve
  • D) Amplifying sound waves before they reach the tympanic membrane
Answer: C — Cochlear implants bypass damaged hair cells and directly stimulate the auditory nerve with electrical signals.
75. A person reports tasting sweetness whenever they hear high-pitched sounds. This neurological phenomenon is:
  • A) Olfactory hallucination
  • B) Synesthesia
  • C) Sensory adaptation
  • D) Gustatory agnosia
Answer: B — Synesthesia: involuntary cross-activation of sensory modalities (hearing triggering taste, colors triggering sounds, etc.).
76. The sense of taste is formally called __________ and uses receptors called __________ found in structures called __________.
  • A) Olfaction; hair cells; olfactory bulbs
  • B) Gustation; taste buds; papillae
  • C) Gustation; papillae; taste pores
  • D) Somesthesis; free nerve endings; dermis
Answer: B — Gustation → taste buds (receptors) → located in papillae (bumps on tongue).
77. A woman pinches her nose before eating a hospital meal to make it more tolerable. She is reducing the contribution of __________ to her overall flavor perception.
  • A) Gustation
  • B) Somesthesis
  • C) Olfaction
  • D) Kinesthesia
Answer: C — Up to ~80% of "taste" is actually smell. Blocking olfaction dramatically reduces flavor experience.
78. Looking at the image below (not shown): two vertical lines of the same length, one with outward-pointing arrowheads, one with inward-pointing arrowheads. The one with inward arrows looks longer. This BEST illustrates the interaction of:
  • A) Opponent-process theory and visual cortex
  • B) Top-down processing overriding bottom-up sensory data (Müller-Lyer)
  • C) Figure-ground and closure
  • D) Binocular disparity and convergence
Answer: B — Müller-Lyer illusion: learned associations with corners (top-down) override the raw retinal data (bottom-up) that both lines are equal.
79. Which of the following pairings of sense and formal name is INCORRECT?
  • A) Hearing — Audition
  • B) Smell — Olfaction
  • C) Balance — Kinesthetic sense
  • D) Touch — Somesthetic sense
Answer: C — Balance = Vestibular sense. Kinesthetic sense = awareness of body part location/movement. Common trap question.
80. A researcher places participants in a room with gradually dimming lights, so slow they never consciously notice the change. By the end, the room is very dark. This manipulation exploits:
  • A) The absolute threshold
  • B) Sensory adaptation combined with the difference threshold
  • C) Dark adaptation
  • D) Subliminal perception
Answer: B — Because each individual change falls below the JND (difference threshold), the cumulative change is never consciously detected.

⚡ QUICK REVISION CHEATSHEET — Sensation & Perception

👁️ THE EYE

StructureFunction
CorneaFirst refraction of light (major bending)
PupilOpening that controls light amount
IrisColored muscle that controls pupil size
LensFine-tunes focus (changes shape = accommodation)
RetinaBack of eye; contains rods & cones
FoveaCenter of retina; highest cone density; sharpest detail/color
Optic nerveCarries visual signal to brain
Blind spotWhere optic nerve exits; NO photoreceptors
Light's Path: Cornea → Pupil → Lens → Vitreous humor → Retina → Optic nerve → Brain

🔵 RODS vs. CONES

RodsCones
LocationPeripheryFovea (center)
LightDim/darkBright light
Vision typeBlack & white, peripheralColor, detail, fine acuity
AdaptationDark (slow ~30 min)Light (fast ~seconds)
Count~120 million~6 million

🌈 VISIBLE SPECTRUM & LIGHT PROPERTIES

  • Wavelength → determines Color (short = blue/violet; long = red)
  • Amplitude → determines Brightness
  • Visible range: ~380–700 nm
  • Refraction: bending of light as it passes through different media (cornea/lens)

🎨 COLOR VISION THEORIES

TheoryLevelKey Idea
Trichromatic (Young-Helmholtz)Cones (retina)3 cone types: Red, Green, Blue
Opponent-Process (Hering)Ganglion cells + brainPaired opponents: R↔G, B↔Y, Black↔White
AfterimageOpponent-processFatigued channel → opponent color appears

👁️‍🗨️ VISION PROBLEMS

ConditionProblemDetail
MyopiaNearsightednessGood near, bad far
HyperopiaFarsightednessBad near, good far
AstigmatismIrregular corneaBlurry at ALL distances
ConjunctivitisPink eyeInflammation, contagious
GlaucomaOptic nerve damageTunnel vision, peripheral loss first
Color blindnessCone dysfunctionMost common: red-green (X-linked)

👂 THE EAR

Sound Path: Outer ear → Tympanic membrane (eardrum) → Ossicles (malleus, incus, stapes) → Oval window → Cochlea (hair cells) → Auditory nerve → Brain
Sound Properties:
  • Frequency (Hz) → Pitch (high Hz = high pitch)
  • Amplitude → Loudness/Volume (decibels)
  • Echo = reflected sound wave
  • Echolocation = using reflected sound to detect objects

🦻 HEARING LOSS TYPES

TypeCauseFix
ConductivePoor transfer from eardrum to inner earCommon with age; hearing aids
Sensorineural / Nerve deafnessDamaged hair cells or auditory nerve; loses HIGH pitches firstCochlear implant
Cochlear implant: Converts sound → electrical signals → directly stimulates auditory nerve (bypasses hair cells)

👅 TASTE (GUSTATION)

  • 5 Tastes: Sweet, Sour, Salty, Bitter, Umami (savory)
  • Taste buds = receptors; located in papillae on tongue
  • Supertasters = dense papillae → heightened sensitivity (hate bitter)
  • Non-tasters = fewer papillae → crave spicy/sweet
  • Flavor = Taste (gustation) + Smell (olfaction) = Chemical sense

👃 SMELL (OLFACTION)

  • Lock & key system: odor molecules fit specific olfactory receptors
  • ~1,000 receptor types
  • Olfactory bulbs: above sinuses, below frontal lobes
  • Pheromones: airborne chemical signals (social/reproductive)

🖐️ OTHER SENSES

SenseFormal NameKey Receptor
SightVisionRods & Cones
HearingAuditionHair cells (cochlea)
SmellOlfactionOlfactory receptor cells
TasteGustationTaste buds (papillae)
Touch/Temp/PainSomestheticSkin receptors
BalanceVestibularSemicircular canals, otolith
Body positionKinestheticJoint & limb receptors
  • Homunculus: brain map of body; lips & hands = largest representation
  • Phantom limb: brain still processes signals for lost limb
  • Gate Control Theory: spinal cord "gate" controls pain; touch closes the gate

📏 THRESHOLDS & PERCEPTION LAWS

ConceptDefinition
Absolute thresholdWeakest stimulus detected 50% of the time
Difference threshold (JND)Smallest detectable difference between two stimuli
Weber's LawJND = constant proportion of original stimulus (e.g., 2% of weight)
Sensory adaptationDecreased sensitivity to constant, unchanging stimulus
Subliminal perceptionProcessing stimuli below conscious awareness
Inattentional blindnessMissing stimuli when attention is focused elsewhere
Change blindnessFailing to detect changes in a visual scene

🧩 GESTALT PRINCIPLES

PrincipleRule
ProximityNear objects → grouped together
SimilaritySimilar objects → grouped together
ContinuityPrefer smooth, continuous patterns
ClosureFill in gaps to complete a figure
Figure-GroundSeparate figure (focus) from background
ConnectednessConnected elements → seen as one unit

📐 DEPTH CUES

BINOCULAR (2 eyes needed):
  • Retinal disparity — slightly different images from each eye → depth
  • Convergence — eyes turn inward for near objects
MONOCULAR (8 cues — 1 eye is enough):
CueHow It Works
Linear perspectiveParallel lines converge at horizon
Relative sizeSmaller image = farther away
InterpositionOverlapping = closer object in front
Aerial perspectiveDistant objects look hazy/bluer
Texture gradientTexture gets denser/less distinct with distance
Relative heightHigher in visual field = farther
Relative clarityClearer = closer
Motion parallaxNear objects move faster across visual field

🌀 ILLUSIONS & CONSTANCIES

ConceptKey Point
Müller-LyerArrow fins create depth cues → distort line length
Moon illusionHorizon cues make moon look bigger near horizon
Shape constancyObject shape perceived as stable despite angle changes
Color constancyObject color perceived as stable despite lighting changes
Lightness constancyObject brightness perceived as stable despite illumination changes

⬆️⬇️ TOP-DOWN vs. BOTTOM-UP

ProcessingDirectionDriven By
Bottom-upSenses → BrainRaw sensory data
Top-downBrain → SensesExpectations, experience, knowledge, context
Synesthesia: involuntary blending of two senses (e.g., seeing colors when hearing music)
Total: 80 questions across all topics. Here's the breakdown:
SectionQuestionsCount
Eye structure & light path1–1414
Color theories & problems15–206
Ear & hearing21–288
All senses (taste, smell, touch, kinesthesia, vestibular)29–4012
Thresholds, adaptation, subliminal, blindness41–488
Gestalt principles49–546
Depth perception & monocular cues55–628
Constancies & illusions63–664
Top-down vs. bottom-up67–693
Mixed hard application70–8011
Study tip: Go through the cheatsheet first, then test yourself on the questions cold. Good luck!

more question. same everything and cover everything

🧠 AP Psychology — Sensation & Perception ROUND 3

Hardest Level | All New Questions | Application & Scenario Based

👁️ SECTION 1: EYE STRUCTURE & LIGHT PATH

1. The lens of the eye changes its curvature to focus on objects at different distances. This process is called:
  • A) Refraction
  • B) Accommodation
  • C) Adaptation
  • D) Convergence
Answer: B — Accommodation: the lens flattens for far objects and bulges/thickens for near objects.
2. Dr. Patel injects a dye into a patient's eye that fills the fluid between the lens and retina. This chamber contains:
  • A) Aqueous humor
  • B) Vitreous humor
  • C) Synovial fluid
  • D) Intraocular plasma
Answer: B — Vitreous humor fills the large chamber between lens and retina. Aqueous humor is in the front chamber (between cornea and lens).
3. A patient's ophthalmologist says their intraocular pressure is dangerously elevated, compressing the optic nerve. This is the mechanism behind:
  • A) Myopia
  • B) Astigmatism
  • C) Glaucoma
  • D) Macular degeneration
Answer: C — Glaucoma: elevated pressure damages the optic nerve → progressive vision loss → tunnel vision.
4. Light hits the retina and is converted into neural signals. Which cells are responsible for this transduction?
  • A) Ganglion cells
  • B) Bipolar cells
  • C) Rods and cones (photoreceptors)
  • D) Amacrine cells
Answer: C — Rods and cones perform phototransduction — converting light energy into neural signals.
5. A patient's left optic nerve is severed in an accident. What happens to their vision?
  • A) They lose color vision in both eyes
  • B) They lose all vision in the left eye only
  • C) They lose peripheral vision in both eyes
  • D) They lose vision in the right visual field of both eyes
Answer: B — The optic nerve from each eye carries signals from that eye. Severing the left optic nerve before the optic chiasm = total blindness in the left eye.
6. When you stare directly at a word, your vision is sharpest because the image falls on the:
  • A) Optic disc
  • B) Peripheral retina
  • C) Fovea
  • D) Blind spot
Answer: C — The fovea has the highest density of cones → maximum visual acuity and color detail.
7. Which psychological property of light corresponds to its wavelength?
  • A) Brightness
  • B) Saturation
  • C) Hue (color)
  • D) Intensity
Answer: C — Wavelength = Hue (color). Amplitude = Brightness. Purity = Saturation.
8. A man with a detached retina experiences sudden "floaters" and flashes. The retina has peeled away from which underlying layer it normally presses against?
  • A) Cornea
  • B) Iris
  • C) Choroid (pigmented layer with blood supply)
  • D) Sclera
Answer: C — The retina rests against the choroid, which supplies it with oxygen and nutrients. Detachment separates them.

🌈 SECTION 2: COLOR VISION & AFTERIMAGES

9. According to the trichromatic theory, a person who sees yellow is likely experiencing:
  • A) Activation of yellow-specific cones
  • B) Simultaneous activation of red and green cones
  • C) Activation of blue cones at a high frequency
  • D) Opponent suppression of all three cone types
Answer: B — No yellow cones exist. Yellow is perceived when red and green cones are activated together (color mixing).
10. A researcher shows participants a bright yellow square for 45 seconds, then a white screen. The afterimage will be:
  • A) Red
  • B) Blue
  • C) Green
  • D) Violet
Answer: B — Yellow's opponent color is blue. Yellow fatigue → blue afterimage (opponent-process theory).
11. Which of the following best explains why we can see an afterimage on a white wall but NOT on a black wall?
  • A) Black walls absorb all wavelengths, leaving no light to trigger opponent channels
  • B) White walls reflect all wavelengths, providing a neutral canvas for the fatigued channel's opponent to appear
  • C) Rods dominate on black surfaces and cannot process color
  • D) The cornea scatters light differently on dark surfaces
Answer: B — Afterimages require reflected light. White reflects all wavelengths, letting the opponent color dominate. Black absorbs all → no signal.
12. Marta stares at a blue-yellow optical illusion flag for 30 seconds, then looks at white paper. She sees:
  • A) Blue and yellow
  • B) Red and green
  • C) Yellow and blue (the same flag)
  • D) Green and orange (complementary colors)
Answer: B — Blue's opponent is yellow; yellow's opponent is blue... wait — in opponent-process: Blue↔Yellow, Red↔Green. Staring at Blue → afterimage is Yellow; staring at Yellow → afterimage is Blue. For a blue-yellow flag: the blue portions produce yellow afterimage and yellow portions produce blue afterimage → you'd see the opponent flag. But trick: if the flag has BOTH blue and yellow, you see yellow/blue reversed. The answer B (red/green) would apply to a red/green flag. For this question, the correct answer for a blue-yellow flag is D — the colors swap to their opponents: yellow↔blue. Correction: The answer is D — yellow where blue was, blue where yellow was (opponents).
Answer: D — Opponents swap: blue areas → yellow afterimage; yellow areas → blue afterimage.
13. A person with red-green color blindness is MOST likely missing or having reduced function in which cones?
  • A) All three types equally
  • B) Red (L) and/or green (M) cones
  • C) Blue (S) cones only
  • D) Rod photoreceptors in the fovea
Answer: B — Red-green color blindness = loss or mutation of L (long/red) or M (medium/green) cone photopigments.

👂 SECTION 3: EAR, HEARING & PROPERTIES OF SOUND

14. The three ossicles transmit vibrations from the tympanic membrane to the oval window in which order?
  • A) Incus → Malleus → Stapes
  • B) Stapes → Incus → Malleus
  • C) Malleus → Incus → Stapes
  • D) Malleus → Stapes → Incus
Answer: C — Malleus (hammer) → Incus (anvil) → Stapes (stirrup) → oval window. MIS = My Icy Stapes.
15. Hair cells in the cochlea are damaged by years of listening to heavy metal concerts at 110 decibels. The patient will MOST likely initially lose the ability to hear:
  • A) Very low bass tones
  • B) Mid-range conversational speech
  • C) High-pitched frequencies
  • D) All frequencies equally
Answer: C — Sensorineural hearing loss from noise damage preferentially destroys high-frequency hair cells first.
16. A submarine uses sonar pulses that bounce off the ocean floor and return. This is analogous to which phenomenon in hearing?
  • A) Amplitude modulation
  • B) Frequency doubling
  • C) Echolocation / Radar effect
  • D) Conductive resonance
Answer: C — Echolocation/radar: emitting a sound and using the echo's return time/direction to locate objects.
17. A tuning fork vibrating at 440 Hz produces middle A. The "440" refers to:
  • A) The amplitude of the sound wave
  • B) The number of cycles per second — determining pitch
  • C) The decibel level of the sound
  • D) The wavelength in millimeters
Answer: B — Hz (Hertz) = cycles per second = frequency = perceived pitch. 440 Hz = middle A.
18. Two sounds are played simultaneously: one at 30 dB and one at 90 dB. The difference in decibels corresponds to a difference in which property?
  • A) Pitch
  • B) Timbre
  • C) Loudness (amplitude/volume)
  • D) Frequency
Answer: C — Decibels measure amplitude (height of sound wave) → perceived as loudness/volume.
19. An elderly gentleman hears low voices fine but can't hear his grandchildren's high-pitched voices. He most likely has:
  • A) Conductive hearing loss
  • B) Sensorineural hearing loss (presbycusis)
  • C) Tympanic membrane perforation
  • D) Otosclerosis
Answer: B — Presbycusis: age-related sensorineural hearing loss, characteristically affects high frequencies first.
20. A child is born deaf. After audiological testing, the cause is confirmed as poor mechanical transmission through the middle ear, with normal cochlear function. The recommended first-line intervention is:
  • A) Cochlear implant
  • B) Hearing aid (amplifies sound mechanically)
  • C) Gene therapy targeting hair cells
  • D) Auditory nerve stimulation
Answer: B — Conductive hearing loss (mechanical problem) → hearing aids amplify sound. Cochlear implants are for sensorineural loss (damaged hair cells/nerve).
21. The semicircular canals are filled with fluid. When you shake your head "no," this fluid shifts. This sends a signal about:
  • A) The frequency of surrounding sounds
  • B) Changes in rotational head movement (vestibular sense)
  • C) The position of your limbs relative to each other
  • D) Pressure changes affecting the eardrum
Answer: B — Semicircular canals detect rotational/angular movement and send vestibular signals about head rotation.

👅 SECTION 4: TASTE, SMELL & CHEMICAL SENSES

22. A chef has a bad head cold and can't taste her food well despite her tongue being perfectly healthy. This is because:
  • A) The cold virus attacks taste buds
  • B) Blocked nasal passages eliminate the olfactory contribution to flavor
  • C) Inflammation affects the papillae directly
  • D) Pain from sinuses competes with taste signals in the brain
Answer: B — ~80% of flavor perception comes from olfaction. Blocked nose → no smell → food tastes bland.
23. Researchers testing a new vegetable find that supertasters rate it as unbearably bitter, while non-tasters barely notice the bitterness. The most likely explanation is:
  • A) Supertasters have more opponent-process channels for bitter
  • B) Supertasters have denser papillae with more taste buds per cm²
  • C) Non-tasters have overactive olfactory systems compensating for weak taste
  • D) Supertasters have a genetic mutation causing taste hallucinations
Answer: B — Supertasters: higher papillae density → more taste buds → heightened sensitivity, especially to bitter.
24. The olfactory system is unique among sensory systems because it sends signals DIRECTLY to:
  • A) The thalamus before reaching the cortex
  • B) The brainstem for immediate reflex response
  • C) Limbic structures (amygdala, hippocampus) without first passing through the thalamus
  • D) The prefrontal cortex for immediate conscious processing
Answer: C — Unlike other senses that relay through the thalamus, olfaction projects directly to the limbic system — explaining why smells trigger powerful emotions and memories.
25. A dog marks its territory with urine to signal other dogs. The chemical signals being detected are:
  • A) Olfactory bulb projections
  • B) Gustatory proteins
  • C) Pheromones
  • D) Semiochemical metabolites only
Answer: C — Pheromones: airborne chemical signals that convey social/reproductive/territorial information.
26. The five basic taste categories are sweet, sour, salty, bitter, and:
  • A) Spicy
  • B) Fatty
  • C) Umami
  • D) Astringent
Answer: C — Umami (savory/meaty) is the 5th basic taste, triggered by glutamate (found in meat, aged cheese, soy sauce).
27. Taste buds are embedded inside structures on the tongue called:
  • A) Olfactory papillae
  • B) Papillae
  • C) Gustatory ganglia
  • D) Chemoreceptor villi
Answer: B — Papillae (the bumps on your tongue) house taste buds. Supertasters have more papillae per unit area.

🖐️ SECTION 5: TOUCH, PAIN, KINESTHESIA & VESTIBULAR

28. A surgeon stimulates a patient's hand area in the somatosensory cortex during brain surgery. The patient reports feeling sensations in their hand even though the hand wasn't touched. This experiment demonstrates:
  • A) Phantom limb sensation
  • B) The topographic organization of the somatosensory cortex (homunculus)
  • C) Gate control theory activation
  • D) Synesthetic cross-activation
Answer: B — The somatosensory homunculus maps body regions topographically in the cortex. Stimulating a specific cortical region triggers sensation in its corresponding body part.
29. A yoga instructor always knows where her foot is during a pose even with her eyes closed. She relies on:
  • A) Vestibular sense
  • B) Kinesthetic sense
  • C) Somesthetic sense
  • D) Proprioceptive cortex hallucination
Answer: B — Kinesthetic sense: joint and limb receptors relay information about body part position and movement.
30. A patient reports pain in their left shoulder after a heart attack. The heart and shoulder share overlapping neural pathways. This is called:
  • A) Phantom limb pain
  • B) Gate control activation
  • C) Referred pain
  • D) Somatosensory overflow
Answer: C — Referred pain: pain felt at a location other than where it originates, due to shared spinal pathways.
31. After breaking his wrist, Tom is told to rub the area around the cast to reduce the aching. According to gate control theory, this works because:
  • A) Rubbing releases endorphins that destroy pain receptors
  • B) Touch signals from large fibers close the spinal "gate," blocking pain signals
  • C) Repeated stimulation causes sensory adaptation to pain
  • D) The rubbing distracts the reticular activating system
Answer: B — Gate Control Theory (Melzack & Wall): large-diameter touch fibers compete with and inhibit small pain fibers at the spinal cord gate.
32. A pilot experiences vertigo during a cloud-covered night flight because:
  • A) Hearing loss distorts air pressure signals
  • B) The vestibular system sends conflicting signals with no visual reference to reconcile them
  • C) The kinesthetic sense overrides vestibular signals at high altitudes
  • D) Rods don't function in total darkness, disrupting balance centers
Answer: B — Without visual reference, the vestibular system alone can be fooled, causing spatial disorientation/vertigo.
33. The sense responsible for detecting temperature, pressure, pain, and light touch from the skin is:
  • A) Kinesthetic sense
  • B) Vestibular sense
  • C) Somesthetic (somatosensory) sense
  • D) Proprioceptive only
Answer: C — Somesthetic sense = skin sensations: touch, pressure, temperature, pain (multiple receptor types in skin).
34. Which of the following best describes what the homunculus illustrates?
  • A) The size of the brain relative to body mass
  • B) The disproportionate cortical area devoted to highly sensitive body parts
  • C) The motor pathways controlling voluntary movement
  • D) The visual cortex's map of the retina
Answer: B — The sensory homunculus is a distorted body map where hands, lips, and face are enormously large, reflecting their dense receptor populations.

📏 SECTION 6: THRESHOLDS, WEBER'S LAW & ADAPTATION

35. A hearing test plays tones at decreasing volumes. The patient stops hearing a tone at 20 dB. For them, 20 dB represents their:
  • A) Difference threshold for that frequency
  • B) Absolute threshold for that tone
  • C) Weber fraction limit
  • D) Sensory adaptation floor
Answer: B — Absolute threshold = the minimum stimulus intensity detectable 50% of the time.
36. A chef adds salt to soup. The soup already has 10g of salt. To notice a difference, she needs to add 1g more. If the soup had 20g, she would need to add 2g. This demonstrates:
  • A) Sensory adaptation
  • B) Absolute threshold consistency
  • C) Weber's Law (constant proportion JND)
  • D) Subliminal taste perception
Answer: C — Weber's Law: JND = constant ratio. Here it's 10% regardless of base amount.
37. You get into a heavily perfumed elevator. Five minutes later, you barely smell the perfume anymore. This illustrates:
  • A) Weber's Law
  • B) Subliminal olfaction
  • C) Sensory adaptation
  • D) Olfactory blindness
Answer: C — Sensory adaptation: the constant stimulus triggers reduced receptor firing over time.
38. A subliminal audio track is embedded in a relaxation tape claiming to reduce anxiety. Research on subliminal messaging most accurately suggests:
  • A) It reliably and powerfully changes complex behavior and emotions
  • B) It can weakly influence simple responses but cannot override conscious beliefs or motivations
  • C) It has no effect whatsoever on any psychological process
  • D) It only works through the olfactory system
Answer: B — Subliminal perception is real but weak. It can prime simple responses, but cannot reliably produce strong behavioral or emotional changes.
39. During a loud concert, you stop noticing the background roar and only hear the music. This is BEST explained by:
  • A) Conductive hearing loss from the volume
  • B) Sensory adaptation to the constant background noise
  • C) The absolute threshold elevating due to volume
  • D) Gate control blocking auditory pain signals
Answer: B — Sensory adaptation: the constant background sound becomes less noticeable over time as receptors habituate.
40. A grocery store plays soft music at 2 dB below shoppers' absolute thresholds for hearing, hoping to influence buying behavior. This is an example of:
  • A) Change blindness
  • B) Inattentional stimulation
  • C) Subliminal perception
  • D) Sensory adaptation marketing
Answer: C — Subliminal: presented below the absolute threshold, outside conscious awareness.

🎭 SECTION 7: INATTENTIONAL BLINDNESS, CHANGE BLINDNESS & MISDIRECTION

41. A pickpocket bumps into you and apologizes profusely while patting your shoulder. While your attention is on the interaction, they remove your wallet. They exploited:
  • A) Sensory adaptation of touch
  • B) Inattentional blindness / the art of misdirection
  • C) Change blindness
  • D) Subliminal perception
Answer: B — Misdirection: focused attention on one event (apology) causes inattention to another (wallet theft).
42. A witness to a crime is shown a video of the event. Between two clips, the perpetrator's hat color changes from blue to red. The witness doesn't notice. This is:
  • A) Inattentional blindness
  • B) Sensory adaptation to color
  • C) Change blindness
  • D) Top-down perceptual filling
Answer: C — Change blindness: failure to detect changes in a scene, especially across cuts, blinks, or interruptions.
43. What is the KEY difference between inattentional blindness and change blindness?
  • A) Inattentional blindness involves color; change blindness involves shape
  • B) Inattentional blindness = missing something that was never attended to; change blindness = missing a change in something already visible
  • C) They are the same phenomenon with different names
  • D) Change blindness only occurs in visual scenes; inattentional blindness spans all senses
Answer: B — Inattentional blindness: unexpected stimulus ignored because attention is elsewhere. Change blindness: a change to an already-viewed stimulus is missed.

🧩 SECTION 8: GESTALT PRINCIPLES (ADVANCED)

44. An artist draws a road disappearing into the horizon with trees on either side getting progressively closer together. Which TWO Gestalt/depth principles are most at work?
  • A) Similarity and closure
  • B) Proximity and linear perspective
  • C) Connectedness and interposition
  • D) Figure-ground and continuity
Answer: B — Trees getting closer together = proximity grouping; road converging = linear perspective (also a monocular depth cue).
45. You're looking at a reversible figure — sometimes you see a vase, sometimes two faces. This classic illusion demonstrates:
  • A) Binocular rivalry
  • B) Gestalt figure-ground switching
  • C) Perceptual constancy failure
  • D) Color opponent fatigue
Answer: B — The Rubin's Vase: figure and ground reverse, showing how the brain alternates between organizing the same image two ways.
46. Olympic rings: five interlocking circles. You perceive each ring as a complete circle even though parts are hidden. This is:
  • A) Proximity
  • B) Interposition depth cue
  • C) Closure
  • D) Connectedness
Answer: C — Closure: the brain fills in the hidden portions of each ring to perceive complete circles.
47. In a constellation map, nearby stars are perceptually grouped into patterns (e.g., the Big Dipper). This is primarily:
  • A) Similarity
  • B) Continuity
  • C) Proximity
  • D) Connectedness
Answer: C — Proximity: stars spatially near each other are grouped into constellations perceptually.
48. A graphic designer connects all elements of a logo with a thin line. Even though the shapes differ in color and size, you perceive them as one unit. This is:
  • A) Closure
  • B) Similarity
  • C) Connectedness
  • D) Continuity
Answer: C — Connectedness: physically linked elements are perceived as belonging together regardless of other differences.

📐 SECTION 9: DEPTH PERCEPTION & MONOCULAR CUES

49. A 3D movie creates the illusion of depth by presenting slightly different images to each eye simultaneously, mimicking:
  • A) Motion parallax
  • B) Retinal (binocular) disparity
  • C) Texture gradient
  • D) Convergence
Answer: B — 3D movies exploit retinal disparity by showing each eye a slightly offset image, just as the real world creates slightly different retinal images in each eye.
50. When you hold your finger close to your face and blink each eye alternately, the finger seems to "jump." This difference between the two retinal images is called:
  • A) Convergence
  • B) Accommodation
  • C) Retinal disparity
  • D) Motion parallax
Answer: C — Retinal disparity: each eye sees a slightly different image due to their different horizontal positions. The closer the object, the greater the disparity.
51. A landscape photographer blurs the background to make the subject pop forward. This technique mimics which monocular cue?
  • A) Interposition
  • B) Relative clarity
  • C) Aerial perspective
  • D) Texture gradient
Answer: B — Relative clarity: clearer/sharper objects appear closer; blurry objects appear farther away.
52. You're looking at a photo of a vast wheat field. Near your feet the stalks are distinct and large; far away they blur into a dense carpet. This is:
  • A) Linear perspective
  • B) Relative height
  • C) Texture gradient
  • D) Motion parallax
Answer: C — Texture gradient: surface texture becomes denser and less detailed with increasing distance.
53. In a Western movie, a distant mountain appears hazy and slightly blue-gray compared to the sharp, vivid foreground. This cue is:
  • A) Relative size
  • B) Interposition
  • C) Texture gradient
  • D) Aerial (atmospheric) perspective
Answer: D — Aerial perspective: particles in the atmosphere make distant objects appear hazier and desaturated (bluer/grayer).
54. While riding a bike, a child notices that the nearby road markings flash past quickly while the distant hills barely seem to move. This is:
  • A) Retinal disparity
  • B) Texture gradient
  • C) Motion parallax
  • D) Relative size
Answer: C — Motion parallax: near objects appear to move faster than far objects when the observer is moving.
55. Which of the following depth cues requires the brain to sense the muscular tension of inward eye rotation when focusing on close objects?
  • A) Retinal disparity
  • B) Convergence
  • C) Accommodation
  • D) Motion parallax
Answer: B — Convergence: eyes rotate inward for near objects. The brain uses the tension from eye muscles to infer distance.
56. A tall building in the background looks smaller than a person in the foreground, even though you know the building is larger. This illustrates which monocular cue AND which perceptual constancy working AGAINST each other?
  • A) Relative size (cue) fighting color constancy
  • B) Relative size (cue) overridden by size constancy
  • C) Interposition (cue) overriding shape constancy
  • D) Linear perspective defeating lightness constancy
Answer: B — Relative size says "smaller = farther," but size constancy allows you to know the building is actually enormous — these two processes interact.

🌀 SECTION 10: CONSTANCIES & ILLUSIONS

57. An actor walks from the back of a stage to the front. Their retinal image doubles in size, but you perceive them as the same height. This is:
  • A) Shape constancy
  • B) Color constancy
  • C) Size constancy
  • D) Lightness constancy
Answer: C — Size constancy: perceived size stays stable even as retinal image size changes with distance.
58. You take a photo indoors under yellow fluorescent lights. In the photo, a white wall looks yellow. But when you were standing there, it looked white to you. This is:
  • A) Lightness constancy
  • B) Color constancy
  • C) Shape constancy
  • D) Sensory adaptation to wavelength
Answer: B — Color constancy: the brain corrects for ambient lighting to perceive object colors as stable. Cameras don't do this correction.
59. The Ponzo illusion shows two identical horizontal lines between converging railroad tracks. The upper line looks longer. This is caused by:
  • A) Opponent-process color fatigue
  • B) Linear perspective cues making the upper line appear farther → brain scales it up
  • C) Gestalt continuity grouping the upper line with more track
  • D) Binocular disparity
Answer: B — Ponzo illusion: linear perspective makes the top line appear farther; size constancy scaling makes it look larger to compensate.
60. The moon appears LARGEST when:
  • A) It is directly overhead at midnight
  • B) It is near the horizon with buildings and trees providing reference cues
  • C) The sky is clear and there are no clouds for comparison
  • D) It is at perigee (closest orbital point)
Answer: B — Moon illusion: reference objects at the horizon (trees, buildings) provide depth cues that make the brain "scale up" the moon's size via size constancy.
61. A square tilted 45° still looks like a square (or diamond) to you even though its retinal image is now a rotated quadrilateral. This is:
  • A) Color constancy
  • B) Size constancy
  • C) Shape constancy
  • D) Figure-ground stability
Answer: C — Shape constancy: perceived shape remains stable despite changes in retinal image orientation.

🔄 SECTION 11: TOP-DOWN vs. BOTTOM-UP PROCESSING

62. A proofreader misses a typo because the surrounding context makes her expect a correctly spelled word. This illustrates:
  • A) Bottom-up processing overriding visual data
  • B) Change blindness at the word level
  • C) Top-down processing (expectations filling in gaps)
  • D) Inattentional blindness
Answer: C — Top-down: prior knowledge and expectations shape perception, sometimes causing us to see what we expect, not what's there.
63. A baby who has never seen a dog sees one for the first time and processes the shape, color, and movement without any prior concept. This is:
  • A) Top-down processing
  • B) Bottom-up processing
  • C) Perceptual set
  • D) Gestalt organization
Answer: B — Bottom-up: pure data-driven processing, building perception from raw sensory features up.
64. After reading a scary novel before bed, you hear a creak in your house and immediately think "intruder!" even though it's just the house settling. This is:
  • A) Subliminal fear priming
  • B) Bottom-up auditory processing
  • C) Top-down processing guided by a perceptual set (expectation)
  • D) Sensory adaptation failure
Answer: C — Top-down / perceptual set: the novel primed your brain to expect danger, shaping interpretation of ambiguous sensory input.

🎯 SECTION 12: MIXED HARDEST APPLICATION

65. A student reports "seeing" a number as inherently red and the smell of vanilla as "rounded." This is called:
  • A) Olfactory hallucination
  • B) Synesthesia
  • C) Sensory conversion disorder
  • D) Cross-modal priming
Answer: B — Synesthesia: automatic, involuntary cross-activation of multiple sensory modalities.
66. Which of the following correctly pairs a vision condition with its cause?
  • A) Myopia — irregularly shaped cornea
  • B) Hyperopia — eyeball too long
  • C) Astigmatism — irregularly shaped cornea
  • D) Glaucoma — lens becomes opaque
Answer: C — Astigmatism = irregular cornea → blurry at all distances. Myopia = eyeball too long. Hyperopia = eyeball too short. Glaucoma = optic nerve damage from pressure. (Cataracts = opaque lens.)
67. A patient with sensorineural hearing loss in the high frequencies is fitted with a cochlear implant. The device works by:
  • A) Mechanically amplifying sound vibrations before the cochlea
  • B) Replacing the tympanic membrane
  • C) Electrically stimulating the auditory nerve, bypassing damaged hair cells
  • D) Surgically repairing the ossicles
Answer: C — Cochlear implant: microphone captures sound → processor converts to electrical signals → electrodes in cochlea stimulate auditory nerve directly.
68. According to the opponent-process theory, why is it IMPOSSIBLE to perceive a "reddish-green" color?
  • A) Red and green wavelengths cancel out physically in the air
  • B) Red and green are processed by the same opponent channel — one suppresses the other, so both cannot activate simultaneously
  • C) Rods cannot distinguish between red and green wavelengths
  • D) The trichromatic theory prevents simultaneous cone activation
Answer: B — Opponent-process: Red and green are opponents on the same channel. When one fires, the other is inhibited — so "reddish-green" is a physiological impossibility.
69. A researcher uses fMRI to show that when participants hear a specific word (e.g., "lemon"), their taste cortex activates even without tasting anything. This best demonstrates:
  • A) Subliminal gustation
  • B) Synesthesia in all participants
  • C) Top-down processing — conceptual knowledge activating sensory cortex
  • D) Absolute threshold for taste being exceeded by language
Answer: C — Top-down: language/conceptual processing can activate sensory cortex through learned associations.
70. A hiker notices that the gravel path near her feet shows large, distinct stones, while the path far ahead looks like a smooth gray strip. Which monocular depth cue is this?
  • A) Interposition
  • B) Texture gradient
  • C) Relative clarity
  • D) Aerial perspective
Answer: B — Texture gradient: nearby surface elements appear larger and distinct; distant ones blend into a fine texture.
71. You measure the JND for weight at 100g to be 2g. At 200g, the JND should be:
  • A) 2g (same absolute amount)
  • B) 4g (same proportion — 2%)
  • C) 1g (halved because sensitivity increases)
  • D) 10g (doubles for heavier loads)
Answer: B — Weber's Law: JND is a constant proportion (2% here). 2% of 200g = 4g.
72. A visual illusion shows two tables of identical dimensions, but one appears longer and thinner. The illusion results from linear perspective cues applied to the table legs. This BEST demonstrates:
  • A) Bottom-up sensory data overriding knowledge
  • B) The Gestalt principle of similarity
  • C) Top-down processing imposing depth/perspective on a flat image
  • D) Binocular disparity creating false size judgments
Answer: C — Top-down: the brain applies 3D depth-processing rules (learned from experience) to a 2D image, distorting size perception.
73. A patient reports that after their stroke, white paper under yellow light still looks white, but objects in dim light look much darker than they should. Which constancy is damaged?
  • A) Color constancy
  • B) Shape constancy
  • C) Lightness constancy
  • D) Size constancy
Answer: C — Lightness constancy: the ability to perceive object brightness as stable across different illumination levels.
74. A magician asks you to follow a red ball in their right hand. While you watch it, their left hand switches the cup positions. You miss the switch. This is:
  • A) Change blindness
  • B) The art of misdirection causing inattentional blindness
  • C) Subliminal visual processing
  • D) Sensory adaptation to movement
Answer: B — Misdirection: deliberately directing attention to one stimulus causes inattentional blindness to another.
75. Which of the following senses does NOT relay information through the thalamus on its way to the cortex?
  • A) Vision
  • B) Hearing
  • C) Olfaction (smell)
  • D) Touch
Answer: C — Olfaction is unique: it projects directly to the limbic system (amygdala, hippocampus) without a thalamic relay — all other senses route through the thalamus.
76. You see the letter "B" written ambiguously. In the sentence "THE CAT," you read it as B. In "10E12," you read it as 13. The SAME image is perceived differently based on context. This demonstrates:
  • A) Change blindness
  • B) The absolute threshold shifting with context
  • C) Top-down processing / perceptual set
  • D) Gestalt closure
Answer: C — Classic demonstration of perceptual set: context (top-down) shapes interpretation of identical sensory input.
77. A patient loses their right arm. Two months later, they report feeling pain in their right hand when their left cheek is touched. Researchers explain this as:
  • A) Gate control malfunction
  • B) Phantom limb pain due to cortical remapping — the hand's cortical area is now being activated by adjacent face inputs
  • C) Referred pain from the surgical wound
  • D) Somesthetic adaptation failure
Answer: B — After limb loss, the cortex area that mapped the hand is taken over by adjacent areas (often the face), causing touch on the face to be felt in the phantom hand.
78. A woman with normal eyesight enters a pitch-black room. After 20 minutes, she can see shapes faintly. After 30 minutes, her vision is much better. The improvement from 20–30 minutes is due to:
  • A) Cones completing their adaptation cycle
  • B) Rods reaching maximum rhodopsin regeneration sensitivity
  • C) Pupils dilating to maximum size
  • D) The fovea switching to rod-based processing
Answer: B — Dark adaptation: rods slowly regenerate rhodopsin (light-sensitive pigment) over ~30 minutes, dramatically increasing sensitivity. The 20–30 min period represents the final rod adaptation phase.
79. A researcher presents a word for 5ms — well below conscious detection — but participants later choose that word more often in a free association task. This is evidence for:
  • A) Inattentional blindness
  • B) Subliminal priming
  • C) Absolute threshold override
  • D) Change blindness in semantic memory
Answer: B — Subliminal priming: below-threshold stimuli can influence subsequent behavior/choices without conscious awareness.
80. Which of the following most accurately describes the relationship between wavelength, color, and brightness?
  • A) Wavelength = brightness; amplitude = color
  • B) Wavelength = color (hue); amplitude = brightness
  • C) Frequency = brightness; wavelength = saturation
  • D) Amplitude = color saturation; wavelength = loudness
Answer: B — Wavelength → Color/Hue (what color you see). Amplitude → Brightness (how intense/bright). Purity/Saturation → how rich the color is.
81. A neurologist notes that a patient with cortical damage can feel a pinprick on their arm but cannot localize where on the arm it is. This suggests damage to:
  • A) The peripheral nerve endings
  • B) The spinal cord's gate control mechanism
  • C) The somatosensory cortex's homuncular map
  • D) The thalamic relay for pain
Answer: C — The somatosensory homunculus maps body location. Damage disrupts the ability to localize where on the body a sensation is occurring.
82. You are standing at the back of a concert venue. The bass feels like it's vibrating your chest. The treble is barely audible. This is because:
  • A) High-amplitude low-frequency sounds lose treble first with distance
  • B) Low-frequency (bass) sounds have longer wavelengths that travel farther and pass through objects; high-frequency sounds attenuate faster
  • C) Your ossicles resonate more with bass frequencies
  • D) The vestibular system amplifies bass perception at high amplitudes
Answer: B — Low frequency = long wavelength = travels farther and penetrates barriers more easily. High frequency attenuates faster with distance and absorption.
83. A researcher exposes participants to a rapid series of photos. In one, a violent image is embedded for a single frame. Heart rate increases even though participants report not seeing it. This suggests:
  • A) The absolute threshold for vision was exceeded subconsciously
  • B) Subliminal visual stimuli can trigger physiological responses without conscious perception
  • C) Change blindness causes emotional responses
  • D) Inattentional processing activates the sympathetic nervous system
Answer: B — Subliminal perception: stimuli below conscious awareness can still trigger physiological/emotional responses (amygdala processing).
84. Complete this analogy: Rods : scotopic (dim light) vision :: Cones : __________ vision
  • A) Monochromatic
  • B) Peripheral
  • C) Photopic (bright light / color / detail)
  • D) Achromatic
Answer: C — Photopic vision = bright-light, color, high-acuity vision driven by cones. Scotopic = dim-light vision driven by rods.
85. A patient says, "I can read signs close up fine, but I bump into things on the sides because I can't see them." This pattern is characteristic of:
  • A) Myopia
  • B) Hyperopia
  • C) Glaucoma destroying peripheral vision
  • D) Astigmatism
Answer: C — Glaucoma classically destroys peripheral vision first while preserving central vision — causing tunnel vision.

📋 ADDITIONAL CHEATSHEET — High-Yield Tricky Details

⚡ MOST COMMONLY CONFUSED PAIRS

Confused PairHow to Tell Apart
Inattentional blindness vs. Change blindnessInattentional = missed entirely (gorilla). Change blindness = missed a CHANGE to something already visible
Rods vs. ConesRods = dim/periphery/B&W. Cones = bright/fovea/color/detail
Absolute threshold vs. JNDAbsolute = weakest detectable stimulus. JND = smallest detectable DIFFERENCE
Conductive vs. Sensorineural hearing lossConductive = mechanical problem (middle ear). Sensorineural = hair cells/nerve damage
Kinesthetic vs. VestibularKinesthetic = body PARTS position (joints/limbs). Vestibular = balance/rotation (inner ear)
Top-down vs. Bottom-upTop-down = brain/experience shapes perception. Bottom-up = raw sensory data builds perception
Myopia vs. HyperopiaMyopia = near OK, far bad. Hyperopia = far OK, near bad
Trichromatic vs. Opponent-ProcessTrichromatic = at CONES (receptors). Opponent-process = at ganglion cells/brain

🔑 QUICK MEMORY HOOKS

  • MIS = Malleus → Incus → Stapes (ossicles order)
  • Afterimage color = stare at X → see opponent color (red→green, blue→yellow, black→white)
  • Supertaster = MORE papillae = MORE sensitive = HATES bitter
  • Non-taster = FEWER papillae = LESS sensitive = CRAVES spicy/sweet
  • Weber's Law = JND is always the SAME % of the original (not the same amount)
  • Gate Control = TOUCH closes the gate to PAIN at spinal cord
  • Olfaction = ONLY sense that bypasses thalamus → goes direct to limbic system
  • Cochlear implant = for SENSORINEURAL loss (nerve/hair cells). Hearing aids = CONDUCTIVE loss
  • Rods adapt to dark in ~30 min; cones adapt to light in ~seconds
  • 8 monocular cues: Linear perspective, Relative size, Interposition, Aerial perspective, Texture gradient, Relative height, Relative clarity, Motion parallax
  • 2 binocular cues: Retinal disparity + Convergence

🎯 WAVELENGTH = COLOR QUICK REFERENCE

WavelengthColor
~380–450 nmViolet / Blue
~450–495 nmBlue
~495–570 nmGreen
~570–590 nmYellow
~590–620 nmOrange
~620–700 nmRed
Short wavelength = Blue/Violet | Long wavelength = Red
85 new questions total. Combined with the previous 80, that's 165 questions covering every concept. Good luck — you've got this!

quick memonics for light and sound path in ears and eyes and for other things. and also cheatsheet revision for everything. and things to remember

⚡ AP PSYCH — MASTER MNEMONICS + CHEATSHEET

Everything You Need. One Place.

🧠 PART 1: MNEMONICS

👁️ LIGHT'S PATH THROUGH THE EYE

"Can People Look Very Rarely On Optometrist's Brains?"
LetterStructure
CanCornea
PeoplePupil
LookLens
VeryVitreous humor
RarelyRetina
OnOptic nerve
BrainsBrain
🔁 Short version: "C-P-L-V-R-O-B" — just say it fast like a word: "Cup-Lurb"

👂 SOUND'S PATH THROUGH THE EAR

"The Odd Man Instantly Squeezes Over Crazy Auditors"
LetterStructure
TheTympanic membrane (eardrum)
OddOssicles
ManMalleus (hammer)
InstantlyIncus (anvil)
SqueezesStapes (stirrup)
OverOval window
CrazyCochlea (hair cells)
AuditorsAuditory nerve → Brain
🔁 Short version for ossicles only: MIS — Malleus → Incus → Stapes Say: "My Icy Stapes"

🌈 8 MONOCULAR DEPTH CUES

"Real Textures Are Intense — Lovely Motion, Relatively Clear"
LetterCue
RealRelative size
TexturesTexture gradient
AreAerial/atmospheric perspective
IntenseInterposition (overlap)
LovelyLinear perspective
MotionMotion parallax
RelativelyRelative height
ClearRelative clarity
🔁 Short: "RT AI LM RC" — or just remember "8 mono cues = RT AILMRC"

🎨 OPPONENT COLOR PAIRS

"RGB's Enemies: Red-Green Bicker, Yellow-Blue Argue, Black-White War"
  • 🔴 Red ↔ 🟢 Green
  • 🔵 Blue ↔ 🟡 Yellow
  • ⚫ Black ↔ ⚪ White
🔁 "RG BY BW" — "Really Great, But You, Black/White" Afterimage rule: Stare at X → see its opponent on white wall

👅 5 BASIC TASTES

"Some Salty Babies Scream Umami"
  • Sweet
  • Salty
  • Bitter
  • Sour
  • Umami
🔁 Or: "SSBSU" — "Sour Salty Bitter Sweet Umami"

🦻 HEARING LOSS TYPES

"Conductive Cars, Sensorineural Nerves"
  • Conductive = Car parts breaking (mechanical — middle ear, eardrum, ossicles) → hearing aid
  • Sensorineural = Sensor/nerve damage (hair cells, auditory nerve) → cochlear implant
🔁 "Conductive = Conduct sound = mechanical. Sensorineural = Sensor/nerve = hair cells"

🔬 RODS vs. CONES — QUICK HOOK

"Rods: Dark, Dull, Distant edges. Cones: Colorful, Clear, Center"
  • RODS = Real Dark, Rim of retina (periphery), Black & white
  • CONES = Color, Center (fovea), Crisp detail, bright light
🔁 "3 C's for Cones: Color, Center, Clear" "3 D's for Rods: Dark, Dull, edges (Distant)"

🧩 GESTALT PRINCIPLES

"Please See Cute Foxes Carelessly Connecting"
LetterPrinciple
PleaseProximity
SeeSimilarity
CuteContinuity
FoxesFigure-Ground
CarelesslyClosure
ConnectingConnectedness
🔁 Short: "PS CF CC" — "PS: Can Foxes Cuddle Cats?"

👁️ VISION PROBLEMS

"My Hyperactive Aunt Gets Color Confused"
LetterCondition
MyMyopia (near-sighted)
HyperactiveHyperopia (far-sighted)
AuntAstigmatism (irregular cornea)
GetsGlaucoma (optic nerve)
ColorConjunctivitis (pink eye)
ConfusedColor blindness

🔊 SOUND PROPERTIES

"Frequency = Pitch. Amplitude = Volume."
  • Frequency (Hz) = how fast = Pitch (high Hz = high pitched)
  • Amplitude (height of wave) = Volume (decibels = loudness)
🔁 "F = Pitch, A = Volume" — "FAT Pitch Volumes" (F→P, A→V)

💡 LIGHT PROPERTIES

"Wavelength = Color. Amplitude = Brightness."
  • Wavelength = Color/Hue (short = blue, long = red)
  • Amplitude = Brightness
🔁 "WAC AB" — "Wavelength= Color, Amplitude = Brightness" 🔁 ROYGBIV = Red→Violet = Long→Short wavelength

👃 OLFACTION SPECIAL RULE

"Smell Skips the Thalamus — Goes Straight to Feelings"
All senses → Thalamus → Cortex Smell ONLY → Limbic system (amygdala + hippocampus) directly That's why smells trigger powerful MEMORIES and EMOTIONS

📏 WEBER'S LAW

"The richer you are, the more you need to notice a raise."
If you earn $10/hr → notice $1 raise (10%) If you earn $100/hr → need $10 raise to notice (still 10%) JND = constant % of original stimulus, not a fixed amount

🚪 GATE CONTROL THEORY

"Rubbing CLOSES the pain gate."
Touch/pressure (large fibers) → close the gate → less pain signal reaches brain That's why you rub a bumped elbow, it actually reduces pain neurologically.

📋 PART 2: MASTER CHEATSHEET

👁️ THE EYE — COMPLETE

StructureFunctionRemember
CorneaFirst major refractionTransparent outer dome
PupilControls light amount (opening)Black circle
IrisControls pupil sizeColored ring (muscle)
LensFine-tunes focus (accommodation)Flexible, changes shape
Vitreous humorFills eye, maintains shapeGel between lens & retina
Aqueous humorFluid in front chamberBetween cornea and lens
RetinaContains photoreceptorsBack of eye = "screen"
FoveaSharpest vision (dense cones)Dead center of retina
Blind spotNo photoreceptors (optic nerve exit)You can't see here at all
Optic nerveSends signal to brainExits at blind spot

🔵 RODS vs. CONES

FeatureRodsCones
LocationPeripheral retinaFovea (center)
Light conditionDim / darkBright light
What they detectMovement, B&W, peripheralColor, fine detail
Count~120 million~6 million
Dark adaptation~30 minutes (slow)~seconds (fast)
Used forNight vision, side visionReading, color, faces

🌈 LIGHT & THE VISIBLE SPECTRUM

PropertyPerception
WavelengthHue/Color
AmplitudeBrightness
PuritySaturation (richness of color)
Visible range~380 nm (violet) → ~700 nm (red)
ROYGBIV: Short wavelength = Violet/Blue. Long wavelength = Red.

🎨 COLOR VISION THEORIES

TheoryWhereHow
Trichromatic (Young-Helmholtz)Cones (retina)3 cone types: Red (L), Green (M), Blue (S)
Opponent-Process (Hering)Ganglion cells → brainOpponent pairs: R↔G, B↔Y, Black↔White
Both are correct — at different stages. Together they explain all color vision and afterimages.
Afterimage rule: Stare at color X → opponent appears on neutral surface
  • Stare at red → see green
  • Stare at blue → see yellow
  • Stare at black → see white

👁️ VISION PROBLEMS

ConditionCauseKey Detail
MyopiaEyeball too longGood near, bad far
HyperopiaEyeball too shortBad near, good far
AstigmatismIrregular cornea shapeBlurry at ALL distances
ConjunctivitisInflammation (viral/bacterial)Pink, itchy, contagious
GlaucomaOptic nerve damage (↑ pressure)Peripheral → tunnel vision
Color blindnessCone deficiency (X-linked)Most common: red-green

👂 THE EAR — COMPLETE

Sound path:
Outer ear → Tympanic membrane → Malleus → Incus → Stapes → Oval window → Cochlea (hair cells) → Auditory nerve → Brain
StructureFunction
Pinna (outer ear)Funnels sound in
Tympanic membraneVibrates with sound (eardrum)
Ossicles (3 bones)Amplify & transmit vibrations
MalleusHammer — attached to eardrum
IncusAnvil — middle ossicle
StapesStirrup — hits oval window
Oval windowMembrane between middle/inner ear
CochleaFluid-filled; hair cells detect frequency
Semicircular canalsBalance & rotational movement
Auditory nerveSends signal to brain

🔊 SOUND PROPERTIES

PropertyPerceptionUnit
FrequencyPitch (high Hz = high pitch)Hz (Hertz)
AmplitudeLoudness/VolumedB (decibels)
EchoReflected sound wave—
EcholocationLocating objects using echo return—
Human hearing range: 20 Hz – 20,000 Hz

🦻 HEARING LOSS

TypeCauseFix
ConductivePoor mechanical transmission (middle ear)Hearing aid; common with age
Sensorineural / Nerve deafnessHair cell or auditory nerve damage; loses HIGH pitches firstCochlear implant
Cochlear implant: Sound → electrical signals → directly stimulates auditory nerve (bypasses hair cells)

🫀 ALL HUMAN SENSES

SenseFormal NameReceptor/Location
SightVisionRods & Cones (retina)
HearingAuditionHair cells (cochlea)
SmellOlfactionOlfactory receptor cells (~1,000 types)
TasteGustationTaste buds in papillae (tongue)
Touch/Pain/TempSomesthetic senseSkin receptors
BalanceVestibular senseSemicircular canals + otolith organs
Body positionKinesthetic senseJoints & limb receptors
Smell + Taste combinedChemical sense—

👅 TASTE (GUSTATION)

TermDefinition
5 tastesSweet, Sour, Salty, Bitter, Umami
Taste budsReceptors for taste
PapillaeBumps on tongue housing taste buds
SupertasterDense papillae → hypersensitive → hates bitter
Non-tasterFew papillae → low sensitivity → craves spicy/sweet
FlavorTaste + smell together (chemical sense)

👃 OLFACTION (SMELL)

TermDefinition
Lock & keyOdor molecules bind to specific receptors
~1,000 receptorsTypes of olfactory receptor cells
Olfactory bulbsAbove sinuses, below frontal lobes
PheromonesAirborne chemical social/reproductive signals
Unique pathwayONLY sense that bypasses thalamus → goes to limbic system directly

🖐️ TOUCH, PAIN, BODY SENSES

ConceptKey Point
SomestheticSkin: touch, pressure, temp, pain
KinestheticBody part location (joints/limbs)
VestibularBalance and rotation (inner ear)
HomunculusCortical body map; hands/lips = biggest area
Gate Control TheoryTouch closes spinal gate → less pain signal
Referred painPain felt away from source (e.g., heart attack → shoulder)
Phantom limbBrain still maps missing limb; cortical remapping

📏 THRESHOLDS & LAWS

ConceptDefinitionExample
Absolute thresholdWeakest stimulus detected 50% of the timeCandle flame 30 miles away
Difference threshold (JND)Smallest detectable difference between stimuli2g more out of 100g
Weber's LawJND = constant proportion of original stimulusAlways 2%, not always 2g
Sensory adaptationReduced sensitivity to constant stimulusStop smelling perfume after a while
Subliminal perceptionProcessing below conscious awarenessWeak priming effect
Inattentional blindnessMissing stimulus due to focused attention elsewhereGorilla in basketball video
Change blindnessMissing a change in an already-viewed sceneActor's shirt color changes unnoticed

🧩 GESTALT PRINCIPLES

PrincipleRuleExample
ProximityNear = groupedDots in clusters look like groups
SimilaritySame look = groupedRed dots & blue dots form separate rows
ContinuityPrefer smooth patternsDotted curve seen as one arc
ClosureFill in gapsDashed circle seen as complete
Figure-GroundFocus vs. backgroundRubin's vase (face or vase?)
ConnectednessLinked = one unitLogo pieces connected by a line

📐 DEPTH CUES

BINOCULAR (need 2 eyes):

CueHow
Retinal disparityEach eye sees slightly different image → brain calculates depth
ConvergenceEyes turn inward for near objects → muscle tension signals depth

MONOCULAR — 8 cues (1 eye is enough):

CueHow
Linear perspectiveParallel lines converge at horizon
Relative sizeSmaller retinal image = farther
InterpositionOverlapping = closer object is in front
Aerial perspectiveDistant objects look hazy/bluer
Texture gradientSurface detail becomes denser with distance
Relative heightHigher in visual field = farther
Relative clarityClearer = closer
Motion parallaxNear objects move faster across visual field when you move

🌀 CONSTANCIES & ILLUSIONS

ConceptDefinitionExample
Size constancyPerceived size stable despite retinal size changeDistant person still looks normal height
Shape constancyPerceived shape stable despite viewing angleDoor looks rectangular open or closed
Color constancyColors look stable despite lighting changeWhite paper looks white indoors & outdoors
Lightness constancyBrightness looks stable despite illumination changeGray rock looks gray in sun and shadow
Müller-Lyer illusionArrow fins distort line length (top-down depth cues)Lines look different lengths
Moon illusionMoon looks bigger at horizon (depth cues inflate perceived size)Horizon reference objects trigger size scaling
Ponzo illusionConverging lines make equal objects look different sizesRailroad track illusion

🔄 TOP-DOWN vs. BOTTOM-UP

ProcessingDriven ByExample
Bottom-upRaw sensory data → brainNewborn seeing for the first time
Top-downBrain/experience → shapes perceptionReading typos without noticing; hearing your name at a party

🌀 SYNESTHESIA

Involuntary blending of two senses Examples: seeing colors when hearing music, tasting shapes, feeling sounds NOT a disorder — a neurological variation

🔥 PART 3: THINGS TO ABSOLUTELY REMEMBER

⚠️ TOP 15 THINGS STUDENTS GET WRONG

#Common MistakeCorrect Fact
1"Afterimage = same color"No — afterimage = OPPONENT color
2"Rods are in the fovea"No — CONES are in fovea; rods are in periphery
3"Myopia = bad near vision"No — Myopia = bad FAR. "Near-sighted" = sees near fine
4"Cochlear implant fixes all hearing loss"No — only sensorineural. Hearing aids fix conductive
5"Kinesthetic = balance"No — Kinesthetic = body parts. Vestibular = balance
6"Trichromatic explains afterimages"No — opponent-process explains afterimages
7"Weber's Law = same amount to notice"No — same PROPORTION (%) not same amount
8"Smell goes through thalamus like other senses"No — olfaction bypasses thalamus → goes to limbic system
9"Supertasters crave spicy food"No — NON-tasters crave spicy/sweet (less sensitive)
10"Change blindness = inattentional blindness"Different: Change = missed a change. Inattentional = missed entirely
11"Both theories of color are wrong"Both right — at different levels (cones vs. ganglion cells)
12"Conductive hearing loss needs cochlear implant"No — hearing aid for conductive; cochlear implant for sensorineural
13"Glaucoma causes blurry near vision"No — Glaucoma destroys peripheral vision → tunnel vision
14"Top-down = more accurate"Not always — top-down causes illusions, typos missed, biases
15"Absolute threshold is the minimum you can ever detect"It's the level detected 50% of the time — not absolute minimum

🧠 HIGH-YIELD ONE-LINERS

  • Fovea = best day vision. Periphery = best night vision.
  • Rods adapt to dark in ~30 min. Light adaptation takes seconds.
  • All senses go through thalamus EXCEPT smell.
  • Flavor = 80% smell + 20% taste.
  • JND = just noticeable difference = difference threshold.
  • Papillae house taste buds. Taste buds ARE the receptors.
  • Gate control = touch closes pain gate at spinal cord.
  • Phantom limb = cortical remapping, not psychological delusion.
  • Cochlea converts mechanical vibration → neural signal (transduction).
  • Binocular = 2 cues (disparity + convergence). Monocular = 8 cues.
  • Subliminal = weak priming only. Cannot change complex behavior.
  • Synesthesia = senses blend involuntarily.
  • Afterimage requires WHITE surface (reflects all wavelengths).
  • Sensorineural hearing loss → high pitches go first.
  • Non-tasters crave intensity; supertasters avoid intensity.

📌 FINAL MEMORY TABLE — Everything in 2 Lines

TopicRemember This
Eye pathCornea → Pupil → Lens → Vitreous → Retina → Optic nerve
Ear pathEardrum → MIS (Malleus→Incus→Stapes) → Oval window → Cochlea → Auditory nerve
RodsDark, Peripheral, B&W, 120M, 30min dark adapt
ConesBright, Fovea, Color+Detail, 6M, fast light adapt
WavelengthShort = Blue/Violet. Long = Red.
AmplitudeEye = Brightness. Ear = Loudness (dB)
Color theoriesTrichromatic @ cones. Opponent-process @ ganglion/brain
AfterimageStare at X → see opponent color
Myopia/HyperopiaNear-sighted = bad far. Far-sighted = bad near
GlaucomaOptic nerve pressure → tunnel vision
AstigmatismIrregular cornea → blurry at ALL distances
Hearing lossConductive = mechanical = hearing aid. Sensorineural = nerve = cochlear implant
SmellLock & key, 1000 receptors, bypasses thalamus, → limbic directly
Taste5 types: SSBSU. Papillae > taste buds. Super = sensitive. Non = craves spicy
KinestheticBody parts position (joints/limbs)
VestibularBalance + rotation (semicircular canals)
Gate controlTouch closes pain gate at spinal cord
Weber's LawJND = constant % of original stimulus
Absolute thresholdWeakest stimulus detected 50% of the time
Sensory adaptationStop noticing constant unchanging stimulus
SubliminalBelow awareness, weak priming only
InattentionalMissed because attention was elsewhere (gorilla)
Change blindnessMissed a CHANGE in something already viewed
GestaltProximity, Similarity, Continuity, Closure, Figure-Ground, Connectedness
8 Mono cuesLinear, Relative size, Interposition, Aerial, Texture, Height, Clarity, Motion parallax
2 Bino cuesRetinal disparity + Convergence
ConstanciesSize, Shape, Color, Lightness — brain keeps perception stable
Top-downExperience/expectations shape perception
Bottom-upRaw sensory data builds perception
SynesthesiaInvoluntary sense blending
Moon illusionHorizon cues inflate perceived size
Müller-LyerArrow fins = depth cues → distort line length
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