Distinguishing Between Alzheimer's Disease, Lewy Body Dementia, and Parkinson's Disease

This study aims to find better ways to tell apart three brain conditions — Alzheimer's disease, Lewy body dementia, and Parkinson's disease — which can look similar but require different treatments. **You may be eligible if...** - You have been diagnosed with Alzheimer's disease, Lewy body dementia, or Parkinson's disease based on standard clinical criteria - You are able to complete study tasks (scoring at least 10 on the Mini Mental State Examination) - You have been on stable memory or psychiatric medications for at least 4 weeks - You have a family member or close contact who sees you at least 4 days per week - You have adequate vision and hearing for testing **You may NOT be eligible if...** - You have another condition that could explain or complicate your memory problems - You have a serious active medical condition that would prevent participation - You are pregnant or breastfeeding - You have severe kidney disease - English is not your first language or you have fewer than 12 years of education - You have taken part in an experimental study targeting amyloid plaques (unless you only received a placebo) Talk to your doctor to see if this trial is right for you.