1Spinal Cord Injury Center, Balgrist, University Hospital Zurich, University of Zurich, Zurich, Switzerland, 2Department of Neurophysics, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany, 3Wellcome Trust Centre for Neuroimaging, UCL Institute of Neurology, London, United Kingdom, 44Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany