The purpose of this research study is to learn how Deep Brain Stimulation (DBS), which targets a part of the brain called the subthalamic nucleus (STN), may affect thinking and memory in people with Parkinson's Disease (PD). We plan to include about 55 people with PD who have already had DBS surgery at MUSC's Clinical DBS Program.

As part of the study, participants will attend two visits after their DBS surgery. The first visit, which will last about three hours, includes going over the study information and consent form, collecting background information (demographics), and completing tests that measure thinking and memory (cognitive assessments). The second visit, also about three hours, will involve an MRI scan to look at how the brain's networks change when the DBS device is turned on and off.

These findings may help doctors and researchers make better decisions about which patients are most likely to benefit from DBS surgery and how to choose the best stimulation settings to reduce unwanted changes in thinking and memory.

Quitting smoking is hard, and many Veterans struggle even with current treatments. This study is testing a safe, non-invasive brain stimulation called repetitive transcranial magnetic stimulation (rTMS), which is already FDA-approved to help people stop smoking. We're comparing two types—standard and personalized—to see which works better. We aim to find the best option to help Veterans quit for good.

This study is looking for participants who have had a stroke for the first time and have also had weakness (known as "paresis") in their arms or legs. People who have weakness in their arms or legs after their stroke are at risk of developing spasticity. Spasticity is a condition where muscles stiffen or tighten involuntarily, preventing normal movement, and sometimes causing discomfort or pain.

This study is looking at the proportion of first-ever stroke participants with paresis who develop spasticity up to 12 months after their stroke. We would like to do this by contacting you regularly to see whether you have developed spasticity. The study period for each individual participant will vary depending on whether and when spasticity or problematic spasticity develops.