Neurophysiological Markers in Patients With Craniofacial Dystonia and Their Relatives

INCLUSION CRITERIA: Three groups of subjects shall be studied: 1) patients with craniofacial dystonia, 2) first degree relatives of patients with craniofacial dystonia, 3) age matched control group. The inclusion of the group of relatives will be valuable to study, as these individuals have shared similar environment backgrounds as patients but remain free of symptoms. Patients and their relatives 18 years or older will be enrolled through the Human Motor Control Clinic, NINDS, NIH under protocol 93-N-0202: "Diagnosis and Natural History Protocol for Patients with Different Neurological Conditions". Patients with dystonia, enrolled in Protocol 85-N-0195, "Efficacy and Pathophysiology of Botulinum Toxin for Treatment of Involuntary Movement Disorders' will also be eligible for participation in the study. Diagnosis of dystonia will rely on review of medical record, history, and clinical evaluation. Age matched volunteers over 18 years-old entered into the study must be free of neurological disease as determined by a standard physical and neurological examination. INCLUSION CRITERIA FOR VIDEOTAPING: Patients with idiopathic BSP or Meige-Syndrome (=BSP plus oromandibular dystonia), their first degree relatives and age matched volunteers Age18 years or older Eye blink rate at rest more than 27 per minute (patients only) EXCLUSION CRITERIA: Patients, their first degree relatives and normal volunteers with any significant medical or psychiatric illness, pregnancy, history of epilepsy, concurrent use of tricyclic antidepressants, neuroleptic agents, or any other licit or illicit drug that could affect brainstem excitability will not be eligible for this study. Subjects who have a pacemaker, an implanted medication pump, metal objects inside the eye or skull (for example, after brain surgery or a shrapnel would) or any recent (less than 3 months) brain lesions will not be included in this study. Patients who have received botulinum toxin injection less than three months prior to the day of testing will also be excluded. EXCLUSION CRITERIA FOR VIDEOTAPING: Other disease with involuntary blinking (Hemifacial spasm, Tic disorder, Tardive Dyskinesia, Blepharitis) Taking the following medications: antidepressants, anxiolytics, anticonvulsants, antipsychotics, antiparkinson, hypnotics, stimulants, and/or antihistamines Subject's objection to being videotaped while performing different activities First degree relatives and age matched volunteers who are diagnosed with a neurological or psychiatric disease or medication that alter the blink frequency.