Tai Chi for Enhancing Motor and Cognitive Function in Parkinson's Disease

Inclusion Criteria: * Individuals recently diagnosed with idiopathic PD (≤ 10 years) * Limited disease progression * If taking PD-related medication, willingness to undergo baseline and follow-up testing while off medication * Willingness to commit to the study protocols and complete Tai Chi program * Willingness to be videotaped and audio-recorded during testing Exclusion Criteria: * Diagnosis of any form of atypical parkinsonism * History of: stroke, head trauma, brain tumor, brain injury, seizures or other central nervous system condition, orthopedic impairment or other disease that could likely contribute to a gait disturbance or parkinsonism * Any severe, chronic condition or acute medical event for which participation in exercise programs is contraindicated (e.g. debilitating Rheumatoid Arthritis, history of frequent falls, unhealed fracture)\*\* \*\* Unless the participant is able to obtain formal written approval from his/her treating physician granting permission to participate in our Tai Chi exercise program * Participation in brain stimulation within the past 3 months * Family history of seizures or unexplained loss of consciousness * Current history of dementia or severe psychiatric illness. Patients with mild (non-suicidal) depression and/or anxiety may be included * Acute illness requiring hospitalization within past 3 months * History of deep brain stimulation or other brain surgery * Participation in brain stimulation within the past 3 months * Regular use of walking aid * Significant Tai Chi experience (\> 6 months training in past 2 years)