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Marked motor abnormalities, generally limited to those occurring as part of a
non-organic psychotic disorder. This term includes catatonic excitement
(apparently purposeless agitation not influenced by external stimuli), stupor
(decreased reactivity and fewer spontaneous movements, often with apparent
unawareness of the surroundings), negativism (apparent motiveless resistance to
instructions or attempts to be moved), posturing (the person’s assuming and
maintaining an inappropriate or bizarre stance), rigidity (the person’s
maintaining a stance or posture against all efforts to be moved), and waxy
flexibility, or cerea flexibilitas (the person’s limbs can be put into positions
that are maintained).
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