**Study:** This study focuses on people with Parkinson's Disease (PD) who have trouble walking, also known as Freezing of Gait (FOG). It involves a treatment called Deep Brain Stimulation (DBS), which uses a device to send electrical signals to the brain.

**Process:** Before the DBS procedure, participants will have a brain scan called an MRI and tests that check their walking and thinking skills. After DBS, these tests will be repeated several times over a year to see how well the treatment is working. Participants will visit the study site seven times in total.

**Key Points:**

• **Length:** Study lasts about one year with seven visits.
• **Assessments:** Includes MRI scans and tests for walking and cognitive skills.
• **Eligibility:** Must be over 40, have PD and FOG, and be a candidate for DBS surgery.

**Note:** Participants should not have other walking issues not related to PD or any metal in their body that can't go into an MRI machine.