Parkinson's Disease (PD) is a brain disorder that affects movement, often causing tremors. This study looks at how a treatment called Deep Brain Stimulation (DBS) affects decision-making in people with PD. DBS uses electrical signals to help control PD symptoms. The study will focus on the subthalamic nucleus (STN), a brain area important for controlling actions. Sometimes, DBS improves movement but may affect thinking skills like stopping oneself from acting impulsively, which is crucial for daily activities.

Key Points:

• The study lasts up to 18 months for patients with PD, who will have multiple visits. Healthy individuals attend two visits.
• PD patients will be tested with and without their normal medication, and with different DBS settings.
• The study explores how brain stimulation affects the ability to stop certain actions, aiming to improve DBS treatments without harming thinking skills.

Participants include people with PD who need DBS and healthy individuals aged 45-75. The study does not interfere with normal PD treatment decisions. This research hopes to improve the quality of life for people with PD by understanding how DBS affects the brain's control over actions.