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A type of Schizophrenia in which the clinical picture is dominated by at least two of the following:
(1) motoric immobility as evidenced by catalepsy (including waxy flexibility) or
stupor
(2) excessive motor activity (that is apparently purposeless and not influenced by external stimuli)
(3) extreme negativism (an apparently motiveless resistance to all instructions or maintenance of a rigid posture against attempts to be moved) or
mutism
(4) peculiarities of voluntary movement as evidenced by posturing (voluntary assumption of inappropriate or bizarre postures), stereotyped movements, prominent mannerisms, or prominent grimacing
(5) echolalia or echopraxia
Reprinted with permission from the Diagnostic
and Statistical Manual of Mental Disorders, fourth Edition. Copyright 1994 American
Psychiatric Association
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