Neurophysiology of Reward Signaling in Parkinson's Disease

This study examines how the brain processes reward signals in people with Parkinson's disease during deep brain stimulation (DBS) surgery — a procedure where electrodes are implanted in the brain to reduce movement symptoms. The goal is to understand the brain's response to rewards, which may help improve DBS outcomes. **You may be eligible if...** - You are 40 years old or older - You have been diagnosed with Parkinson's disease or another movement disorder - You are already scheduled for deep brain stimulation surgery at Vanderbilt University Medical Center under local anesthesia - The planned surgical path for your electrode will pass through a brain region called the caudate - You can participate in brief testing tasks during surgery - You speak English **You may NOT be eligible if...** - You are under 40 years old - You are unable to participate in intraoperative tasks — for example, if you cannot understand or follow instructions Talk to your doctor to see if this trial is right for you.