Cognitive Testing: Cognitive testing will be conducted on all subjects at baseline and at 12-week follow-up. The battery includes measures that we expect to be sensitive to subtle changes in cognitive function, as well as instruments that appear to have value in prospectively identifying individuals at risk for cognitive decline and/or dementia. Specifically, measures of working memory, memory recall, verbal fluency, executive function, and motor function will be used to detect early functional cognitive changes commonly seen in MCI.