Deep Brain Stimulation for Visuomotor Function in Parkinson's Disease

This study is investigating how deep brain stimulation (DBS) — an implanted brain device — affects eye-hand coordination and visual movement control in people with Parkinson's disease, to help improve DBS programming. **You may be eligible if...** - You have Parkinson's disease and already have bilateral deep brain stimulation (DBS) implants in the subthalamic nucleus (STN) - You have pre-surgery MRI scans available and are able to get post-surgery brain scans - Your Parkinson's symptoms are at a moderate stage when off medication (Hoehn and Yahr stage 2–4) - Your medications and DBS settings have been stable **You may NOT be eligible if...** - You have dementia - You have untreated significant depression or anxiety - You have had other brain surgeries for Parkinson's besides DBS - Your symptoms suggest a different type of movement disorder (atypical parkinsonism) Talk to your doctor to see if this trial is right for you.