Understanding Visual Hallucinations in Lewy Body Diseases

Inclusion Criteria: I) LBD Patients with or without visual hallucinations 1. 18 - 90 yrs 2. Fluent in English or Spanish 3. Score at least 24 out of 30 on the MoCA 4. Diagnosed with Lewy Body diseases, including Parkinson's disease and Lewy Body dementias (Parkinson's disease dementia and dementia with Lewy bodies) II) Age-matched controls (healthy volunteers) 1. 18 - 90 yrs 2. Fluent in English or Spanish 3. Score at least 26 out of 30 on the MoCA Exclusion Criteria: I) LBD Patients with or without visual hallucinations 1. History of traumatic brain injury or significant head trauma 2. History of significant neurologic disorders other than Lewy body diseases 3. Meets DSM-IV criteria for substance abuse or dependence 4. For MRI studies, any contraindication to MRI as determined by the MRI Safety Screening Form II) Age-matched controls (healthy volunteers) 1. History of traumatic brain injury or significant head trauma 2. History of significant neurologic disorders other than Lewy body diseases 3. Meets DSM-IV criteria for substance abuse or dependence 4. For MRI studies, any contraindication to MRI as determined by the MRI Safety Screening Form