Department of Physiology and Biophysics, University of Miami Miller School of Medicine, Miami, FL, USA. The Miami Project to Cure Paralysis, Miami, FL, USA; Department of Neurological Surgery, University of Miami Miller School of Medicine, Miami, FL, USA; Center for Cognitive Neuroscience and Aging, University of Miami Miller School of Medicine, Miami, FL, USA. The Miami Project to Cure Paralysis, Miami, FL, USA; Department of Neurological Surgery, University of Miami Miller School of Medicine, Miami, FL, USA; Bruce W. Carter Department of Veterans Affairs Medical Center, Miami, FL, USA. The Miami Project to Cure Paralysis, Miami, FL, USA; Department of Physiology and Biophysics, University of Miami Miller School of Medicine, Miami, FL, USA. The Miami Project to Cure Paralysis, Miami, FL, USA; Department of Neurological Surgery, University of Miami Miller School of Medicine, Miami, FL, USA; Center for Cognitive Neuroscience and Aging, University of Miami Miller School of Medicine, Miami, FL, USA. Electronic address: ddietrich@med.miami.edu.