Inclusion Criteria:  Clinical diagnosis of idiopathic PD Undergoing scheduled surgery for bilateral STN-DBS at a Cleveland Clinic facility Self-reported response of one or greater on question #3 of the Freezing of Gait Questionnaire (FOG-Q) Ability to walk independently for a minimum of 10 minutes Ability to provide informed consent  Exclusion Criteria:  Neurological disease other than PD, such as stroke or multiple sclerosis Musculoskeletal impairment that affects one's ability to ambulate Presence of active and untreated psychiatric symptoms meeting Diagnostic and Statistical Manual of Mental Disorders-4th Edition (DSM-IV) criteria for Axis-I disorder. Depression and anxiety are very common in patients with Parkinson's disease and are often mitigated as part of routine care. Depression and anxiety will not preclude study participation Cognitive impairment meeting Diagnostic and Statistical Manual of Mental Disorders-4th Edition (DSM-IV) criteria for dementia on formal neuropsychological evaluation Current alcohol or substance abuse Hearing or visual impairment precluding VR use Lack of fluency in English which may invalidate certain tests