 Patients will have clinically documented Tourettes syndrome or chronic motor tic disorder as defined by DSM-IV-TR and evaluation of tic severity using the Yale Tic Scale. This criterion will be established by preliminary screening in the NINDS Movement Disorders Outpatient Clinic. Regarding co-morbid disorders such as ADHD and OCD, we will accept a mild degree of ADHD and mild to moderate degree of OCD. These disorders will be established by a psychiatrist using below listed scales and criteria. 