Inclusion Criteria:  Persons with Parkinson's Disease: Confirmed diagnosis of Parkinson's Disease without presence of any other neurological condition. Persons without Parkinson's Disease (Controls): No previous diagnosis of any neurological condition Persons with a single other neurological disorder (Neuro Controls): Confirmed diagnosis of other neurological condition (e.g. ALS, multiple sclerosis, essential tremor, ataxia, etc).  Exclusion Criteria:  Children (ages younger than 18 years of age) Persons with more than one diagnosed neurological condition.