Normal subject description Lead Investigator: Leslie Phillips Institution : E-Mail : Proposal ID : 173 Proposal Description: Normal subjects in the UDS represent a heterogeneous mix of cognitively intact individuals. Since such subjects are frequently used as control subjects in NACC data analyses, understanding the characteristics of these subjects is of research interest. The aim of this study is a descriptive look at the genetic, demographic and clinical characteristics of subjects entering the UDS with normal cognition.