Brain Activity, Cognitive Function, and Walking Ability in Parkinson's Disease

This study is examining how brain activity, thinking skills, and walking ability are connected in people with Parkinson's disease. It uses brain imaging and physical assessments — no new treatments are involved. The goal is to better understand what drives walking difficulties in Parkinson's. **You may be eligible if...** - You have been diagnosed with Parkinson's disease - You have been on stable Parkinson's medication for at least 2 weeks - You can walk 10 meters without a walking aid - You scored at least 24 on the Mini-Mental State Exam - You do not have uncorrected vision or hearing problems - You completed at least junior high school education **You may NOT be eligible if...** - You have another neurological, bone/joint, or heart/lung condition - You have had brain surgery such as deep brain stimulation Talk to your doctor to see if this trial is right for you.