BRIEF REPORT Interaction between Testosterone and Apolipoprotein E 4 Status on Cognition in Healthy Older Men

School of Psychology (M.S.B., P.D.D.), Murdoch University, Murdoch, Western Australia 6150, Australia; Sir JamesMcCusker Alzheimer’s Disease Research Unit (M.S.B., J.K.F., R.M.C., R.N.M.), School of Exercise, Biomedical, and HealthSciences, Edith Cowan University, and School of Psychiatry and Clinical Neurosciences, University of Western Australia,Hollywood Private Hospital, Nedlands 6009, Western Australia; Neurosciences Unit (J.K.F.), Health Department of WesternAustralia, East Perth Western Australia 6004, Australia; Departments of Geriatric Medicine (R.M.C., D.G.B.), Biochemistry(S.A.P.C.), and Endocrinology and Diabetes (B.B.Y.), Fremantle Hospital, Fremantle, Western Australia 6959, Australia;and School of Medicine and Pharmacology (R.M.C., D.G.B., B.B.Y.), University of Western Australia, Fremantle Hospital,Fremantle, Western Australia 6959, Australia