1. From the Department of Rehabilitation Medicine, University of Kansas Medical Center, Kansas City (D.T.B.); Departments of Biomedical Engineering (D.T.B., R.C., D.W.M., E.C.L.), Neurology (L.S., K.B., L.L., T.H.), Neurological Surgery (E.C.L.), Mechanical Engineering and Material Sciences (E.C.L.), and Neuroscience (E.C.L.), Washington University, St. Louis, MO; and National Center for Adaptive Neurotechnologies, Wadsworth Center, NYS Department of Health, Albany, NY (G.S.).