1. From the Department of Neurology (M.G.S., C.A.E.), Massachusetts General Hospital, Department of Neurology (M.G.S., C.A.E.), Brigham and Women's Hospital, and Center for Neurotechnology and Neurorecovery (B.L.E.), Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston; and Athinoula A. Martinos Center for Biomedical Imaging (B.L.E.), Massachusetts General Hospital, Charlestown.