This study is for people with Parkinson's Disease who have a special treatment called **Deep Brain Stimulation (DBS)**. DBS involves using small electric signals to areas in the brain to help with movement problems. We want to see how DBS affects decision-making and if it increases impulsivity (acting without thinking). We'll also explore if changing the settings of DBS can reduce impulsivity. During the study, participants will do tasks while their DBS device is turned on and off. We will use a brain scan called **Magnetoencephalography (MEG)**, which is safe and measures brain activity.

• **Commitment**: The study requires delaying morning medication for up to 4 hours.
• **Participation**: You'll need to sit in a MEG scanner and follow instructions.
• **Ineligibility**: You cannot join if you have other medical devices or are in other related trials.

This study seeks individuals aged 18 or older who can provide consent. Make sure you can delay your medication and sit still in a scanner before deciding to participate.