This study is designed to help Veterans with Parkinson’s disease (*PD*) improve their walking and balance using a non-invasive method called Vagal Nerve Stimulation (*ncVNS*). Parkinson's disease is a condition that affects the brain and makes it hard for people to move smoothly. The vagal nerve is a long nerve that helps control things like heartbeat and digestion. In this study, a device is placed on the neck to stimulate this nerve, which may help improve walking and reduce falls.

Key Points:

• The study lasts for 4 weeks.
• Participants will use the device at home each day.
• Three groups: active treatment, sham (placebo) treatment, or continue their usual treatment.

To join, you must have Parkinson’s disease, be able to walk for 2 minutes without help, and not have certain health issues like recent heart problems. This study could help Veterans maintain independence and improve their quality of life without needing medication. If successful, it could lead to more at-home treatments for PD in the future.