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Psychiatry · Chapter 3. Healthy and Pathological Personality

Specific personality disorders

Specific personality disorders span a spectrum from normal variants (accentuations) to profound pathological character alterations. They determine human behavior, responses to stress, and susceptibility to somatic and mental diseases.

AuthorK. Leonhard proposed the term "accentuation"
SpectrumFrom norm (accentuation) to disease (defect)
DefectFundamental personality alteration in disease
MaladaptationMain criterion of personality pathology
3 min readFor medical studentsUpdated Sep 20, 2026
Material prepared by WhiteCoat Pro editorial team based on platform study guidesReviewed by medical editor: Aulov A. A., general practitioner · 09/24/2026

Accentuations: extreme variants of normal

The term "accentuation" originates from the Latin accentus (emphasis) and was introduced by K. Leonhard to protect people with unusual behavior by proving they were not mentally ill. In Russian psychiatry, this concept was further developed by A.E. Lichko, who studied adolescents.

Accentuations of personality are healthy individuals with an excessive prominence of certain character traits. They:

  • Differ from the majority while retaining the capacity for social adaptation.
  • Possess increased psychological vulnerability.
  • In real life, more frequently demonstrate mixed types of accentuations rather than pure types.

The type of accentuation determines the response to psychotrauma and the choice of psychological defense mechanisms. It also influences the internal picture of disease and may indicate the risk of developing certain pathologies (for instance, introverts are more prone to peptic ulcer disease and schizophrenia).

From accentuation to pathology

Personality pathology is diagnosed when social maladaptation occurs—persistent conflicts, job loss, or disruption of social ties.

K. Jaspers differentiated between pathological development and true disease (process):

  • Disease shatters adaptation and unrecognizably alters the personality.
  • Pathological development is based on pre-existing traits. Under unfavorable conditions (e.g., upbringing in a single-parent family), original features become hypertrophied, forming a vicious cycle of maladaptation. This state is considered persistent and is rarely reversible even when the situation improves.

A similar mechanism is observed in neurotic development: a patient with a long-standing neurosis adjusts their life to the illness, loses social connections, and stops fighting, which hinders recovery.

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Personality defect in diseases

Severe progressive mental illnesses or organic brain damage lead to a personality defect—the formation of an entirely new character with the loss of former abilities and a shift in needs. The type of defect depends on the disease itself rather than the person's premorbid makeup.

Main variants:

  1. Schizophrenic defect: emotional impoverishment, asceticism, autism. Interests shift toward abstract theories (philosophy, religion). In malignant courses, an apatico-abulic syndrome develops (complete indifference and inactivity).
  2. Organic defect (psycho-organic syndrome): memory and intellect impairment come to the fore. Explosiveness, rapid fatigability, egocentrism, and preoccupation with everyday problems are characteristic.
  3. Epileptic changes: a combination of mental rigidity and explosiveness. Patients are meticulous, vindictive, prone to one-sided righteousness and flattery.
  4. Alcoholic degradation: memory decline, irresponsibility, regressive syntony (superficial sociability). In late stages, memory impairments and organic brain changes develop.

Class and exam questions

What is the difference between an accentuation and pathological personality development?

Accentuation is a variant of the norm in which an individual retains the capacity for adaptation. Pathological development is a persistent disorder leading to social maladaptation due to the hypertrophy of baseline character traits.

What is a personality defect?

This is a fundamental, irreversible alteration of personality resulting from a severe mental or organic illness, in which former abilities are lost, and temperament and the hierarchy of needs change.

How to distinguish an organic defect from a schizophrenic one?

In organic defects, memory and intellect always suffer (intellectual-mnestic decline). In schizophrenic defects, the capacity for understanding and memorization is preserved for a long time, but productivity drops due to emotional impoverishment and abulia.

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What else to study on this topic

  • Detailed classification of accentuation types
  • Mechanisms of psychopathy development
  • Impact of somatic defects on personality development
  • Specifics of psychotherapy selection in different accentuations
  • Features of alcoholic degradation and Korsakoff's syndrome

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