Parkinson's Disease (PD) causes problems with movement, like walking. This study will test if a special device can help people with PD walk better. The device, called a deep brain stimulator (DBS), can be adjusted to help with different types of movements. It senses when a person is walking and changes settings to help them walk better. The goal is to use this device to improve walking while keeping other PD symptoms under control. Six people with PD who already have this device will join the study. The study will last several days, where participants will test different settings at home and track how they feel.

• The study involves a few days of testing at home.
• Participants must have the special DBS device.
• The study is looking for people who can walk but have trouble.