Motor disorders

Subtle disturbance of motor co-ordination is common in schizophrenia. Home videos of children who subsequently develop schizophrenia demonstrate that even in infancy they are noticeably more clumsy than their siblings, suggesting that disturbed motor co-ordination is an aspect of the predisposition to schizophrenia. (1..Z>

More dramatic than subtle motor incoordination are the rare catatonic motor disorders. Catatonia entails disturbance of voluntary motor activity and posture. The level of activity can be either decreased or increased. In extreme cases of hypoactivity the patient is in a stupor, and is unresponsive to stimuli, but usually retains conscious awareness. In hyperactive states the patient often maintains a stereotypic activity for prolonged periods. Even less common are conditions such as waxy flexibility, in which a patient's body can be moulded into an unusual posture, which is then sustained for lengthy periods, and echopraxia, in which the patient mimics the voluntary motor actions of the examiner.

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