Sex differences in cognitive decline in neurodegenerative conditions. Lead Investigator: Chizoba Umeh Institution : Beth Israel Lahey Health E-Mail : chizoba26@gmail.com Proposal ID : 1348 Proposal Description: 1. The goal of the proposed research project is to assess for sex differences in the onset and trajectory of cognitive decline in neurodegenerative conditions including Alzheimer's disease, Lewy Body Dementia and Parkinson's disease. This project will help inform clinical care in an understudied research area. 2. Study Objective Hypothesis: There are significant differences in cognitive performance between women and men with neurodegenerative conditions including Alzheimers disease, Lewy Body Dementia and Parkinsons disease. Aim: Characterize the cognitive phenotype in neurodegenerative conditions including Alzheimers disease, Lewy Body Dementia and Parkinsons disease in female patients versus male patients.