cogwheel rigidity

muscular rigidity that produces a ratcheted resistance to passive movement of the limbs of people who have Parkinson’s disease. It may also be seen as the side effect of medication, especially antipsychotic drugs such as the phenothiazines. Also called cogwheeling. Compare lead-pipe rigidity.

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Psychology term of the day

May 10th 2024

brain abscess

a circumscribed collection of pus that may occur in any part of the brain and, depending on its location, may produce deficits in any neurological function. Brain abscesses are often secondary to infections.