Long-term Brain Stimulation of the Motor Ventral Thalamus (VOP/VIM) to Improve Motor Function

This study aims to recruit patients already implanted with Deep Brain Stimulation (DBS) for movement disorders to complete tasks assessing parameters of motor output, speech, and swallowing functions, both with and without stimulation. DBS parameters would be adjusted prior to motor testing. Patients would then participate in multiple sessions performing contralateral upper extremity movement tasks measuring movement speed, grip strength, and strength modulation, facial movement, swallowing, and speech tasks.