Forensic Psychiatry - Short Notes

(As per FMT by Gautam Biswas, Forensic Psychiatry Chapter)

1. Idiocy

• Idiocy is the most severe grade of intellectual disability (mental subnormality / amentia).
• IQ: 0-20 (Profound grade); mental age below 3 years.
• IQ is calculated as: IQ = (Mental Age / Chronological Age) × 100
• Mental age is assessed by the Binet-Simon test.
• Features:
  • Cannot speak, walk, or care for themselves.
  • Complete dependence on others for all activities.
  • Cannot understand or appreciate the nature of acts.
• Grading of intellectual disability (for reference):

  Grade	Term	IQ Range
  Mild	Feeble-minded / Moron	50-70
  Moderate	Imbecile	35-50
  Severe	-	20-35
  Profound	Idiot	0-20

• Forensic significance: An idiot cannot form criminal intent (mens rea) and is exempt from criminal responsibility under Section 84 IPC.

2. Melancholia

• Melancholia is a severe form of depressive disorder characterized by profound sadness, dejection, and psychomotor retardation.
• Features:
  • Extreme sadness, hopelessness, tearfulness.
  • Loss of interest in all activities (anhedonia).
  • Early morning waking.
  • Psychomotor retardation or agitation.
  • Delusions of guilt, poverty, sin (nihilistic delusions).
  • High risk of suicide.
• Historically, it was used as a broad term for depressive psychosis; now corresponds to severe depressive episode with melancholic features.
• Forensic significance:
  • Person may commit suicide or homicide (altruistic homicide - killing loved ones to "save" them).
  • May be a ground for insanity defence or diminished responsibility if severe.

3. Mutilomania (Note: "Mectilomania" in your query is likely this term)

• Mutilomania is a type of impulse control disorder.
• Defined as: an irresistible impulse to hurt or mutilate animals (or sometimes humans).
• It is classified under impulsions - sudden, irresistible urges to perform a conscious act without any real motive or forethought.
• Other related impulse disorders (for comparison):

  Term	Impulse
  Kleptomania	Steal articles of little value
  Pyromania	Set fire to objects
  Mutilomania	Hurt/mutilate animals
  Dipsomania	Drink alcohol compulsively
  Trichotillomania	Pull out one's own hair

• Forensic significance: Person may not be held fully responsible if the act was truly impulsive and uncontrollable.

4. Mutism

• Mutism is a state in which a person is unable or refuses to speak, despite having intact speech organs.
• Types:
  • Akinetic mutism: No speech and no movement; due to organic brain lesion.
  • Elective (Selective) mutism: Person refuses to speak in specific situations (e.g., social settings) but can speak in others - seen in children with anxiety/adjustment disorders.
  • Hysterical mutism: Loss of speech due to conversion disorder (functional, not organic).
  • Mutism may also occur in severe depression, schizophrenic catatonia, and acute psychotic states.
• Forensic significance:
  • A mute person may be unable to give testimony in court.
  • Mutism can be feigned (malingering) to avoid criminal proceedings - needs careful evaluation.

5. Psychopath (Sociopath)

• Definition: A person who is neither insane nor intellectually defective, but who persistently fails to conform to normal standards of behaviour.
• Features:
  • Abnormal personality - cold, callous, emotionally shallow.
  • Persistently antisocial or disruptive behaviour.
  • Lack of remorse, guilt, or empathy.
  • No appreciation of the moral implications of their actions.
  • Impulsive, irresponsible; may be superficially charming.
  • Cannot form lasting relationships.
  • Behaviour does not improve with punishment.
• Corresponds to Antisocial Personality Disorder (DSM-5) / Dissocial Personality Disorder (ICD-10).
• Assessed using the Hare Psychopathy Checklist-Revised (PCL-R) - a 20-item scale used in forensic settings.
• Forensic significance:
  • Psychopathy is NOT a ground for insanity defence (the person knows the nature of their act).
  • However, it may support a plea of diminished responsibility in some jurisdictions.
  • Commonly encountered in forensic psychiatric evaluations of repeat offenders.

Note: The textbook library does not contain Gautam Biswas's FMT directly, so these notes are compiled from standard FMT forensic psychiatry chapter content (as taught in Indian medical schools and consistent with Biswas's coverage in the Forensic Psychiatry chapter, pp. 461-485 of his textbook). The core content - definitions, IQ grading, impulse disorders, and psychopathy - is standard across all Indian FMT textbooks including Biswas.