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A psychotic disorder characterized by disturbances in thinking (cognition), emotional responsiveness, and behavior, with an age of onset typically between the late teens and mid-30s.
The characteristic disturbances must last for at least 6 months and include at least 1 month of active-phase symptoms comprising two or more of the following: delusions, hallucinations, disorganized speech, grossly disorganized or catatonic behavior, or negative symptoms (e.g., lack of emotional responsiveness, extreme apathy).
Adapted from the APA Dictionary of Psychology