J.L. O'Brien, BA, K.M. O'Keefe, BA, P.S. LaViolette, MS, A.N. DeLuca, BS, D. Blacker, MD, ScD, B.C. Dickerson, MD and R.A. Sperling, MD, MMSc From the Center for Alzheimer Research and Treatment (J.L.O., K.M.O., A.N.D., R.A.S.), Department of Neurology, Brigham and Women's Hospital, Harvard Medical School; and the Departments of Psychiatry (P.S.L., D.B.) and Neurology (B.C.D., R.A.S.) and Athinoul