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habit tic  any tic that is psychogenic in origin; they are repetitive twitching movements that seem purposeless or without a cause, such as twitching of the face, blinking of the eyes, or grimacing. The movements are rapid and always repeated in the same way, unlike the spasms associated with chorea. The motions are carried out automatically in response to a stimulus that may have existed at some former time but no longer does. Called also habit spasm.




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