Inclusion Criteria:  A clinical diagnosis of Parkinson's disease No neurological disorders if interested in participating as a control participant Must be capable of providing informed consent Must be eligible to receive a brain MRI  Exclusion Criteria:  A secondary movement disorder diagnosis in addition to Parkinson's disease Dementia Medical conditions that may make one ineligible for receiving a brain MRI Inability to provide informed consent Control/healthy group: neurological disorders Control/healthy group: cannot walk without an assistive device/mobility problems