Risk factors and Motor Features of Pathological Subtypes of Lewy Body disease Lead Investigator: John Ringman Institution : University of Southern California E-Mail : john.ringman@med.usc.edu Proposal ID : 585 Proposal Description: 1. To investigate the above potential risk factors for four pathologically-defined entities: pathologically normal controls (NCs), ???pure DLB??? (pDLB), ???AD with concurrent DLB pathology,??? (AD w/LBs) and ???pure AD??? (pAD). 2. To characterize the Levy A vs. Levy B scores in patients with pathologically-defined pDLB and pAD.