The goals of this pilot project are three-fold. First, we will determine if there are QEEG differences between normal control subjects and those with mild or moderate HD. Second, we will examine associations between severity of HD and the QEEG differences detected and determine if these QEEG differences are present when comparing the least affected HD subjects and normal controls. Third, we will examine associations between QEEG variables of interest and other clinical variables, including age of onset of symptoms, number of CAG repeats, severity of motor and behavioral symptoms as measured by the Unified Huntington Disease Rating Scale (UHDRS) subscores, and severity of cognitive impairment as measured by the cognitive subscore of the UHDRS and Mini-Mental State Examination (MMSE).