4. Subjects must score within –1.0 standard deviations of the mean performance of healthy individuals on the neuropsychological tests at screen (week –2). Subjects must have a reading equivalency of 8th grade. Participants must also have a MMSE score of 28. (Bravo & Herbert, 1997; Crum et al., 1993). Finally, participants must score a 45 or better on the Berg Balance Test at screening (week –2) to be included in the study.