Eligibility:~DYT-SGCE patients and healthy volunteers (HV) between 15 and 60 years old.
Background:~Myoclonus dystonia (DYT-SGCE) is characterized by myoclonus and dystonia. Such condition is associated with a high prevalence of psychiatric symptoms which are part of the phenotype. The mechanisms underlying these non-motor symptoms are still poorly understood.~Objective:~To investigate the neural correlates of cognition and emotion in DYT-SGCE.~Design:~Participants will have 1 - 2 visits at the clinical center. The total participation time is less than 24 hours.~Participants will have a medical interview and a neurological exam. They may give a urine sample before MRI.~Participants will have a short neuropsychologic and psychiatric interviews. Participants will have MRI scans. They will do small tasks or be asked to imagine things during the scanning.