 This is a double-blind, placebo-controlled, cross-over study testing whether LDX, a stimulant medication, would be effective in alleviating midlife onset impairments of attention and working memory among menopausal women. There will be 3 days in which subjects will undergo a brief cognitive testing assessment; the first testing period will occur at baseline prior to beginning LDX or placebo treatment PT in trial A; the second testing period will occur following 4 weeks of double blind LDX or PT; and the final testing period will take place after another 4 weeks of double blind LDX or PT in Trial B. Each cognitive test period will involve 2 separate cognitive testing batteries that will take approximately 120 minutes total to complete. 