This study is testing a potential new treatment for mild cognitive issues in people with Parkinson's disease, called intermittent theta burst stimulation (**iTBS**). iTBS is a type of brain stimulation approved by the FDA, which means it's generally considered safe for use. The study aims to see if a higher dose of iTBS targeting a specific part of the brain (the right superior parietal lobule, or **rSPL**) could help with memory and attention problems in Parkinson's. The treatment will be given over three days, using 18,000 pulses. This amount is similar to what's been effective in other conditions. Participants need to be between 50-85 years old, diagnosed with Parkinson's and mild cognitive impairment, and stable on their current Parkinson's medications.

• Participation involves three days of treatment.
• Must be comfortable with brain scans (no claustrophobia).
• Participants need a caregiver to help with some assessments.