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

February 17th 2025

mammography

n. a diagnostic procedure that uses low-dose X-ray photography to detect breast tumors or other abnormalities, either noncancerous (benign) or cancerous (malignant). The X-ray negative produced is called a mammogram.