This study explores how Mild Cognitive Impairment (MCI) affects people with Parkinson's Disease (PD). MCI means having trouble with memory, attention, or language but not severe enough to be dementia. The study will use high-density electroencephalography (hdEEG) to measure brain activity and Magnetic Resonance Imaging (MRI) to see brain structure. This helps understand how MCI changes brain connections over time in PD patients.

• Study Length & Visits: One-time assessment with hdEEG and MRI.
• Compensation: Information not provided.
• Risks: No specific risks mentioned, but standard MRI safety applies.

To participate, you should have a cognitive score above certain levels and be taking stable doses of certain medications. You cannot join if you have severe dementia, are on certain recent medications, have metal in your body that affects MRI, or can't walk independently. By joining, you help in understanding and possibly improving treatments for cognitive issues in PD.