Disturbed motor function pervades schizophrenia, though it is difficult now to subtract the effects of antipsychotic treatment. There is evidence from patients never exposed to these drugs that dyskinesia and even parkinsonism are to some degree innate to schizophrenia. Passivity experiences are hallmark symptoms of schizophrenia that can be characterized by the belief that one's thoughts or actions are controlled by an external agent. It has recently been suggested that patients who complain about tardive dyskinesia might simply be experiencing feelings of external control they misattribute to their medication regiment. 

Keywords: Factitious disorders, Malingering, Functional neurological symptoms disorder, Hysteria, Tardive dyskinesia, Paranoid litigation