Characterizing the Specificity and Stability of Local Field Potentials in the Globus Pallidus Internus of Patients Undergoing Deep Brain Stimulation for Parkinson's Disease

Patients undergoing deep brain stimulation for Parkinson's disease based on clinically indicated criteria will have the option to enroll in this study, in which the Activa PC+S generator and corresponding extension leads will be implanted rather than the standard Activa PC system. Patients will be assessed every month for 3 months and then every 3 months after, including off and on medication assessments.