This study looks at a treatment using repetitive transcranial magnetic stimulation, or rTMS, which is a non-invasive way to help the brain work better. It's for veterans with Parkinson's disease, a condition that makes movement and thinking difficult, or similar issues. The study wants to see if rTMS can make thinking skills better and how safe it is to use. Participants in the study will either receive real rTMS treatment or a fake one (called a sham treatment) to compare results. They'll have brain tests and thinking tests at the beginning, end, and one month after treatment.

• The study lasts for around one month with follow-up tests.
• Participants must be veterans diagnosed with Parkinson's or similar conditions.
• Some conditions, like dementia or certain implants, may prevent participation.

Through brain imaging, the study will explore changes in brain connectivity and thinking performance. This research could help make rTMS a better treatment option for those with mild thinking problems related to Parkinson's.