Transcranial Magnetic Stimulation for Children With Tourette's Syndrome

Baseline high-resolution anatomical magnetic resonance images will allow individualized neuronavigation (Brainsight 2, Rogue Research, Montreal QC) to co-register the transcranial magnetic stimulation Airfilm coil (Magistim, UK) precisely to the supplementary motor area as defined by functional magnetic resonance imaging. Interventional low frequency repetitive transcranial magnetic stimulation parameters will be: intensity 100% resting motor threshold, frequency 1 Hz, duration = 20 minutes (1200 stimulations). Treatments will occur on each weekday at the same time of day for three weeks (15 total). These are standard parameters for low frequency repetitive transcranial magnetic stimulation and are well tolerated in children.