Decoding the Neural Mechanisms Underlying Postural Instability and Gait Dysfunction in Parkinson's Disease

Inclusion Criteria: * You have been diagnosed with Parkinson's disease * You already have a deep brain stimulation (DBS) device implanted as part of your medical care - specifically, the Medtronic Percept DBS device * Your DBS settings have been stable for at least 3 months * You experience freezing of gait (sudden inability to move your feet when trying to walk) * You are able to walk on your own for at least 10 minutes without assistance * You are willing to temporarily stop your Parkinson's medications and have your DBS settings adjusted for study testing * You are able to understand the study and provide consent to participate Exclusion Criteria: * You have a neurological condition other than Parkinson's disease (such as stroke or multiple sclerosis) * You have been diagnosed with dementia or have difficulty understanding the study or giving consent * You currently have alcohol or substance abuse problems * You have hearing or vision problems that would make it difficult to use a virtual reality headset * You have any medical or mental health condition that, in the opinion of the study doctor, would make it unsafe or difficult for you to participate