Non-invasive Neurostimulation in Parkinson's Disease

Inclusion Criteria: * Documentation of PD diagnosis from their clinician by either a letter or verification through their medical record * Research criteria of "possible" or "probable" PD, as defined by Gelb et al (Gelb D, Oliver E, Gilman S. Diagnostic Criteria for Parkinson Disease. Arch Neurol.1999;56:33-39)\[1\] * Age 40 or over; * Taking stable medications for at least 30 days Exclusion Criteria: * Features suggestive of other causes of parkinsonism/Parkinson's-plus syndromes; * History of deep brain stimulation or ablation surgery, mass brain lesions; * History of schizophrenia, schizoaffective disorder, other psychosis, episode of bipolar illness, alcohol/drug abuse within the past year; * Need for rapid clinical response due to conditions such as initiation, psychosis, or suicidal; * Contraindications to transcranial brain stimulation or TUS, i.e. metal in the head, implanted brain medical devices, etc; * Unstable medical conditions (e.g. uncontrolled diabetes, uncompensated cardiac issues, heart failure, pulmonary issues, or chronic obstructive pulmonary disease); * Pregnancy. * Epilepsy or disorders that increase likelihood of seizures including: moderate or severe traumatic brain injury, congenital birth defects leading to seizures, brain tumor, metabolism disorders associated with seizures, and nonlacunar stroke.