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Bereitschaftspotential in tic disorders : a preliminary observation.

Author(s): Duggal H | Nizamie S

Journal: Neurology India
ISSN 0028-3886

Volume: 50;
Issue: 4;
Start page: 487;
Date: 2002;
Original page

Keywords: Compulsive Personality Disorder | complications | Contingent Negative Variation | Human | Obsessive-Compulsive Disorder | complications | Tic Disorders | physiopathology | psychology | Tourette Syndrome | physiopathology | psychology

Sensory phenomena in tic disorders such as Touretteā€²s syndrome are known but are substantiated by only a handful of studies. In this preliminary report, we studied premonitory urge, a type of sensory phenomenon in three patients of tic disorders. Bereitschaftspotential, a movement-related cognitive potential indicative of motor preparation, was assessed in these patients. As bereitschaftspotential was observed in all our cases prior to occurrence of tics, it is speculated that tics are not entirely involuntary but are quasi-volitional in nature. Bereitschaftspotential may thus represent a neurophysiological marker of premonitory urge in tic disorders. Implications of exploring the voluntary nature of tics are discussed.

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