We studied 15 patients with AD based on the diagnostic criteria of the National Institute of Neurological and Communicative Disorders and Stroke and the Alzheimer's Disease and Related Disorders Association (NINDS-ADRDA) (McKhann et al., 1984) and 8 patients with MCI based on the guidelines of Petersen et al. (Petersen et al., 1999). All patients underwent general medical, neurological, neuropsychological, and brain MRI assessments as part of the standard diagnostic work-up for dementia. All subjects were assessed for general cognitive function using the Mini-Mental State Examination (MMSE) (see Table 1).