Preclinical and prodromal Lewy body disease in pathologically confirmed PD and DLB Lead Investigator: Lilah Besser Institution : NACC E-Mail : lmbesser@uw.edu Proposal ID : 764 Proposal Description: 1. To characterize the clinical and neuropsychological differences between pathologically confirmed PD and DLB in the time period before a dementia diagnosis. 2. To compare the AD neuropathology in pathologically confirmed PD and DLB