postural tremor

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A form of tremor not easily classifiable as either a passive tremor or an intention tremor, appearing when an attempt is made to maintain a posture, resulting sometimes from lesions in the basal ganglia as in parkinsonism, with a typical frequency of 3–6 hertz, or as a sign of cerebellar syndrome, with a typical frequency of 2.5–4 hertz. See also posturography.

Subjects: Psychology.

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