Gilles de la Tourette's syndrome had been considered an organic, often hereditary illness for many years after it was first described in 1885 (1, 2), but when medicine became psychologically oriented, the syndrome was more frequently classified as a psychological illness (3), and patients have been said to be schizophrenic, psychotic, obsessive-compulsive, hysteric, to have inhibited aggression, and eventually to deteriorate intellectually and psychologically. However, no support for common psychopathological and dynamic factors was found in our previous study of 34 patients or in a review of the literature (4). Recently, as medicine has shifted back from a psychological orientation, and as case histories have accumulated, an organic aetiology has been more frequently postulated.