Psychiatry is the medical specialty devoted to the diagnosis, prevention and treatment of mental disorders. These include various maladaptations related to mood, behaviour, cognition, and perceptions. See glossary of psychiatry.
There are two basic kinds of impersonations: those that are publicly supported and those that are not. Examples of the former are an actor playing a part in a play or a small boy playing fireman. Examples of the latter are a healthy housewife complaining of aches and pains or an unemployed carpenter claiming he is Jesus. When persons stubbornly cling to and aggressively proclaim publicly unsupported role definitions, they are called psychotic.
Thomas Szasz, The Second Sin (New York: 1973), p. 52
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