Departments of Neurosurgery, Stanford University, Stanford, California, United States of America.|National Center for Adaptive Neurotechnologies, Wadsworth Center, New York State Department of Health, Albany, New York, United States of America.|Psychology, Stanford University, Stanford, California, United States of America.|Program in Neurobiology and Behavior, University of Washington, Seattle, Washington, United States of America.|Program in Neurobiology and Behavior, University of Washington, Seattle, Washington, United States of America.