The overall research interest is to determine the brain-behavior relationship in individuals with Parkinson’s disease (PD) and patients with other neurological disorders (e.g., stroke or mild cognitive impairment). The main research focus is to incorporate motor learning concepts into neurorehabilitation to facilitate the intervention effects of physical therapy for people with PD. Transcranial magnetic stimulation (TMS) is used to probe the brain-behavior relationship associated with motor learning and control. Repetitive TMS (rTMS) is also used as an adjuvant intervention approach to augment the benefits of physical therapy.