Inclusion Criteria:  Diagnosis of spasmodic dysphonia (evaluated by 2 centres - one team in Vancouver and the other team in Indiana) Patient is receiving Botox treatments  Exclusion Criteria:  Patients who have muscle tension dysphonia or vocal tremor Patients who have had laryngeal denervation surgery Patients who have intracranial pathology Patients who have a neurodegenerative disease Patients with bleeding diathesis Patients with mild symptoms  Patients who have any of the following MRI contraindications:  Patients with a cardiac pacemaker or defibrillator Patients who have an insulin or infusion pump Patients who have a cochlear, otological, or ear implant Patients who have any implant held in place by a magnet Patients who have any tissue expanders Patients who have an implanted catheter, clamps, clips, valves, or other metal Patients who have any tattoos or permanent makeup above shoulders Patients who have any shrapnel or metal fragments Patients who have had metal removed from their eye Patients who have worked with metal Patients who are pregnant