This category covers psychosis – a form of mental derangement characterized by severely impaired ability to function effectively in the external world – that is not attributable to schizophrenia. Among the five disorders in this group is brief reactive psychosis, which refers to mental derangement lasting from a few hours up to a month, followed by a return to one’s normal level of functioning. In the remarkable condition called induced psychosis, a close friend or relative is “infected” by a psychotic person’s delusion.


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