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Etymology: Gk, mimetikos, imitative, spasmos, spasm
involuntary stereotyped movements of a small group of muscles such as of the face. The spasm is usually psychogenic and may be aggravated by stress or anxiety but is generally controllable momentarily. Multiple grimacing and blinking mimic spasms occur in Gilles de la Tourette's syndrome. Also called tic.
Tourette syndromeAn autosomal dominant disorder (OMIM:137580) appearing in childhood that is characterised by multiple motor and vocal tics present for more than 1 year; obsessive-compulsive behaviour, attention-deficit disorder, coprolalia, echolalia, and other psychiatric disorders may occur.
Defects of SLITRK, which encodes an integral membrane protein involved in neurite outgrowth, have been linked to Tourette syndrome.