Thought disorders – part 2

Disorders of the possession and the content of thought

Delusion

False belief, based on incorrect inference about external reality, that is firmly held despite objective and obvious contradictory proof or evidence and despite the fact that other members of the culture do not share the belief and cannot be corrected by reasoning.
(unspecific productive symptom of different psychoses)

Overvalued idea

False or unreasonable belief or idea that is sustained beyond the bounds of reason and of great personal value (may not be absolutely false but inadequately significant). It is held with less intensity or duration than a delusion but is usually associated with mental illness.
(productive disorder of subpsychotic level, typical for paranoid disorder of personality)

 

Obsessions

Persistent and recurrent idea, thought, or impulse that cannot be eliminated from consciousness by logical effort or reasoning; obsessions are involuntary and ego-dystonic. (usually associated with hypothymia and anxiety. Unspecific productive symptom of neurotic level, usual for neuroses and mild phase of schizophrenia or organic disorders)

Criteria Delusion Overvalued ideas Obsession
Veracity False ideas True ideas False, true or meaningless ideas
Insight Poor Poor Good
Behaviour control Poor, dangerous actions are rather probable Poor but possible Good, no dangerous actions
Diagnosis Organic or functional psychoses Subpsychotic states (initial period of psychoses), paranoid personality Neuroses or mild disorders (initial phase of schizophrenia or organic disorders)
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