1. From the Center for Functional Neuroimaging (A.C.R., J.W., J.A.D.), Department of Neurology (S.E.K., J.A.D.), and Department of Radiology (J.W., J.A.D.), Hospital of the University of Pennsylvania, Philadelphia; Departments of Neuroscience and Radiology (B.M.A.), University of California at San Diego; and UCLA Stroke Center and Department of Neurology (D.S.L.), University of California at Los Angeles.