Neuroimaging in Psychiatry

Introduction

Classification of Neuroimaging Techniques

A. Structural Neuroimaging

• Introduced in 1972; revolutionized diagnostic neuroradiology by allowing imaging of brain tissue in live patients.
• Takes a series of x-ray images 360 degrees around the patient's head; computer assigns specific density to each point.
• Currently the most widely available and convenient imaging tool - every hospital ER has immediate access.
• CSF appears black, brain tissue gray, skull white; poor gray-white matter discrimination.
• Superior to MRI only in detecting calcification.
• Contrast enhancement (iodinated agents) highlights areas where the blood-brain barrier is disrupted (tumors, inflammation).
• Limited by: thick skull base obscuring brainstem details; some tumors invisible (similar attenuation to brain).
• Use in psychiatry: Quick rule-out for structural causes (tumors, hemorrhage, hydrocephalus) in new-onset psychosis or acute mental status change.

• Entered clinical practice in 1982; now the test of choice for clinical psychiatrists and neurologists.
• Based on nuclear magnetic resonance (NMR): hydrogen nuclei align in a magnetic field; radiofrequency pulses cause deviation; realignment emits signals that are computer-analysed.
• Three standard pulse sequences:
  • T1-weighted: Fat appears bright, CSF dark; best for anatomy
  • T2-weighted: CSF appears white, gray-white matter distinction is clear; best for pathology
  • FLAIR (Fluid Attenuated Inversion Recovery): Suppresses CSF signal; highlights white matter lesions
• MRI is far superior to CT for:
  • Gray-white matter differentiation
  • Brainstem and posterior fossa structures
  • White matter abnormalities
  • Small and deep brain infarcts
• Gadolinium contrast MRI is used when tumor is suspected (MRI with gadolinium is preferred for high clinical suspicion of CNS tumor).
• DTI (Diffusion Tensor Imaging): Used to assess myelin integrity in white matter tracts; relevant in detecting disruption in neurodegenerative conditions.

B. Functional Neuroimaging

• Measures regional cerebral blood flow, glucose metabolism, and neurotransmitter receptor density.
• Uses radioactive tracers:
  • FDG-PET: Fluorodeoxyglucose; maps glucose utilization; hallmark hypometabolism in AD (temporal-parietal regions)
  • Amyloid-PET: Detects beta-amyloid (Aβ) accumulation; absence indicates dementia is unlikely due to Alzheimer's
  • Tau-PET (Flortaucipir): Detects hyperphosphorylated tau aggregates in AD, PSP, CBD, frontotemporal lobar degeneration, chronic traumatic encephalopathy
  • DaT-PET: Dopamine transporter scan; distinguishes Parkinson's disease from other movement disorders

• More widely available and less expensive than PET.
• Measures cerebral blood flow using radiopharmaceuticals.
• Used in dementia workup: characteristic hypoperfusion patterns in AD.
• In OCD: shows abnormalities in corticolimbic, basal ganglia, and thalamic circuits.

• Measures BOLD (Blood Oxygen Level Dependent) signal as a proxy for neural activity.
• Used in research to map language, memory, sensory, and motor functions.
• Increasingly applied to studying mood disorders, anxiety, schizophrenia.
• No ionizing radiation; high spatial resolution.

Indications for Neuroimaging in Clinical Psychiatric Practice

• New-onset psychosis
• Acute changes in mental status

• Skull-based meningiomas compress cortex.
• Infiltrative gliomas (astrocytoma, glioblastoma) interrupt white matter tracts.
• Ventricular tumors obstruct CSF flow.

Neuroimaging in Specific Psychiatric Disorders

Schizophrenia

• Neuropathological and volumetric analyses: loss of brain weight, paucity of axons and dendrites in cortex.
• CT/MRI: compensatory enlargement of lateral and third ventricles.
• Most significant volume loss: temporal lobes (most relative volume loss compared to healthy individuals).
• Functional studies: prefrontal hypometabolism ("hypofrontality") on PET/SPECT.

Mood Disorders (Depression)

• Disorders of mood and affect can be associated with loss of brain volume and decreased metabolic activity in the frontal lobes.
• Inactivation of the left prefrontal cortex appears to depress mood.
• Inactivation of the right prefrontal cortex appears to elevate mood.
• PET studies in depression show decreased activity in subgenual anterior cingulate cortex.

OCD (Obsessive-Compulsive Disorder)

• Structural CT/MRI: either no specific abnormality or a smaller caudate nucleus.
• Functional PET/SPECT: abnormalities in corticolimbic, basal ganglia, and thalamic structures.
• Active OCD symptoms: orbital prefrontal cortex shows abnormal activity.
• Treatment response (fluoxetine, clomipramine, or behavioral therapy) produces partial normalization of caudate glucose metabolism on PET.

ADHD

• Either no abnormalities or decreased volume of the right prefrontal cortex and right globus pallidus.
• Usually right caudate > left caudate; in ADHD, caudate nuclei may be equal in size.
• Findings suggest dysfunction of the right prefrontal-striatal pathway for attention control.

Anxiety Disorders / Phobias

• Key circuits studied: amygdala and frontoamygdala connections (perirhinal cortex, ventrolateral PFC, anterior insula).
• Hippocampus plays a critical role in fear learning and extinction.
• Increased neurophysiologic activity in posterior/lateral orbitofrontal cortex, anterior insula, and vlPFC during phobic stimulation.

Research Uses of Neuroimaging

1. Analysis of clinically defined patient groups - grouping patients with schizophrenia, affective disorders, anxiety disorders to discover neuroanatomical and neurochemical bases.
2. Analysis of brain activity during task performance - functional neuroimaging maps:
   • All sensory modalities
   • Gross and fine motor skills
   • Language (Broca's and Wernicke's areas)
   • Memory, calculations, learning
   • Unconscious autonomic sensations
3. Biomarker development - ADNI (Alzheimer's Disease Neuroimaging Initiative) and PPMI (Parkinson's Progression Markers Initiative) are major worldwide programs tracking MCI-to-dementia conversion using MRI, PET, and CSF biomarkers.

Summary Table: Key Neuroimaging Modalities

Note: The library does not contain a book specifically titled "TIPSS." The above answer is drawn from Kaplan & Sadock's (the standard comprehensive psychiatry reference), which covers all the same content expected in a 10-marks neuroimaging question for psychiatry exams.

Countertransference

1. Definition

"Just as the patient has transference, the analyst or psychiatrist has countertransference. This means that the analyst unconsciously experiences the patient as someone from the past. This is usually in response to the patient's transference."

• Kaplan & Sadock's Comprehensive Textbook of Psychiatry

2. Historical Evolution of the Concept

• Countertransference = the analyst's potentially idiosyncratic or personal response to the patient's transference.
• Seen as a possible obstacle to treatment.
• Something the analyst must be aware of and work through in their own analysis.
• When Freud recognized patients developed loving feelings toward analysts (transference), he saw the vulnerability this created in analysts - they might feel gratified by these feelings, setting the stage for boundary violations.

• Carl Jung began an intimate, boundary-violating relationship with patient Sabina Spielrein.
• Josef Breuer's patient developed a delusional pregnancy with an erotic transference, prompting Breuer to immediately terminate treatment - understood as Breuer "acting out" his countertransference.

• Countertransference is now understood as the analyst's natural emotional reaction to the patient.
• Conceptualized as a therapeutic tool used to attune to the patient's internal world.
• The emphasis shifted to the possible positive contributions of countertransference responses.
• The "relational turn" in psychoanalysis moved from a "one-person psychology" (classical ego psychology) to a "two-person psychology" of intersubjectivity - recognizing the analyst's own emotional life as fundamental to the analytic process.

3. Relationship to Transference

1. Transference and countertransference
2. The therapeutic alliance
3. The actual (real) relationship

4. Types of Countertransference

A. Heinrich Racker's Classification (Classical)

• The analyst's experience resonates with the object representation from the patient's internal object world.
• Example: If the patient experiences themselves as a child seeking understanding from a caring parent, and the analyst feels pulled into a parental attitude toward the patient - this is complementary countertransference. The analyst "complements" the patient's internal object dyad.

• An identification with the affective experience of the patient - feeling what the patient is feeling.
• May indicate empathic immersion in the patient's experience.
• However, it can also alert the analyst to a potential blind spot.
• Example: If the analyst is having personal problems with their spouse, and the patient is complaining of feeling criticized by their spouse, the analyst may be over-identified and assume they know exactly what the patient is experiencing - which can bias interpretation.

B. By Origin

5. Mechanisms and Theoretical Underpinnings

Projective Identification (Klein / Object Relations)

• The patient unconsciously induces the analyst to internalize and enact a role that the patient seeks to impose.
• This elicits a countertransference reaction in the analyst, resulting in a transference-countertransference interaction or "enactment."
• The analyst must recognize this induced state rather than simply act on it.

Self-Psychology (Kohut)

• Countertransference is understood within the self-object transference paradigm.
• The analyst's empathic failures and attunement successes constitute a key part of the countertransferential experience.
• Kohut's emphasis on mirroring, idealizing, and alter-ego self-object transferences generates specific countertransferential pulls.

Intersubjectivity (Stolorow, Mitchell, Ogden)

• The analyst's reverie, associations, and felt bodily affects during sessions provide rich countertransference data about the patient's inner world.
• Stephen Mitchell's "interactional hierarchy" identifies four modes relevant to understanding countertransference:
  1. Nonreflective behavior - what is being done to whom (presymbolic)
  2. Affective permeability - affect resonating from person to person (important for understanding intense transference-countertransference)
  3. Self-other configurations - object relations dyads enacted in the therapeutic relationship (the level at which Racker's complementary and concordant countertransference operate)
  4. Intersubjectivity proper - the mutual recognition of two subjectivities

Infant Research (Daniel Stern)

• Stern described "interaffectivity" - the mutual sharing of affect states seen in the mother-infant pair.
• This is the developmental forerunner of the analytic intersubjective process.
• The analyst's responsiveness to the patient's recurrent affect states mirrors the mother's responsiveness to the infant's.

6. Countertransference as Therapeutic Tool

• As analysts become attuned to their own reveries and associations during sessions, they hone an ability to use pattern-recognitions and feelings to better understand patient material.
• The "felt resonances of bodily affect and thought content" often tell the analyst a great deal about the inner workings of the patient's mind.
• The epistemic status of countertransference as "knowledge" about the patient is recognized, though it remains complex - the analyst must distinguish what is "about the patient" from what is "about themselves."

7. Countertransference in Specific Clinical Situations

In Child and Adolescent Psychiatry

• Affective responses to sensitive clinical issues (abortion, adolescent sexuality, parental neglect, assault) constitute countertransference.
• Overidentification with the child patient is dangerous, as are rescue fantasies.
• Younger trainees tend to ally with patients; older psychiatrists (who are parents themselves) may express greater empathy with guardians.
• The clinician must focus on the child's needs, not their own intrapsychic dynamics.

In Geriatric Psychiatry

• Younger therapists treating older patients encounter countertransferential responses around:
  • Death and dying - painful issues that younger therapists prefer not to confront
  • Sexuality in older patients - disconcerting for therapists who have not worked with patients the age of their parents or grandparents
• Example: A 31-year-old female therapist treating a 62-year-old man found his sexual feelings disconcerting. Through supervision and her own therapy, she recognized her countertransference was rooted in her own conflicted attitudes toward the sexuality of her parents and grandparents.

In Suicidal Patients

• Countertransference feelings can be empathic, ambivalent, aggressive, or hostile.
• Awareness of one's own attitudes toward suicide is essential to prevent these responses from interfering with optimal care.

8. The Asymmetry Principle and Risk of Countertransference Enactment

• The relative anonymity of the analyst, clear role expectations, and attention focused on the patient's problems - not the analyst's.
• Sandor Ferenczi's "mutual analysis" (where the analyst also free-associated to the patient and discussed his own feelings) is an example of asymmetry being disregarded - creating pathological consequences as the patient felt pulled to "take care of" the clinician.
• While intersubjective exploration is valuable, the asymmetry of the clinical encounter creates the conditions for a safe playground of the mind in which two subjectivities work together for the benefit of the patient.

9. Management of Countertransference

10. Summary