Neuroplasticity in RBD

Inclusion Criteria for the iRBD Group: * Diagnosis of polysomnogram-confirmed isolated iRBD. * Able to ambulate independently without the use of an assistive device (e.g., cane) for 50 meters. * Age: 21-75 years. Inclusion Criteria For Control Subject Group: * Age: 21-75 years. * Able to ambulate independently without the use of an assistive device (e.g., cane or walker for 50 meters. Exclusion criteria for iRBD group: * Dementia diagnosis and/or a University of California Brief Assessment of Capacity to Consent (UBACC) score and MacCAT-CR score indicating impaired capacity to consent. * History of musculoskeletal disorders that significant affect movement of lower or upper limbs as determined at the time of enrollment. * Other significant neurological disorders that may affect participation or performance in the study. * Anti-depressant associated RBD. Individuals will be excluded if their dream enactment emerged or clearly worsened after initiating an antidepressant medication. * Meet criteria for overt Parkinson's disease, dementia with Lewy bodies, Multiple Systems Atrophy, Alzheimer's disease, or other neurodegenerative disorder, or other known cause of RBD (e.g., narcolepsy and drug induced RBD). * Untreated sleep-disordered breathing * History of musculoskeletal disorders that significantly affect movement of lower or upper limbs as determined at the time of enrollment. * Pregnant women * Additional exclusion criteria for TMS experiments (note that individuals who…