1. Laboratoire de Neurophysique et Physiologie; UMR CNRS 8119; Université Paris Descartes; Paris 75006 France
2. Department of Physiology; Northwestern Feinberg School of Medicine; Chicago IL 60611 USA
3. Departments of Physical Medicine and Rehabilitation; Northwestern Feinberg School of Medicine; Chicago IL 60611 USA
4. Departments of Physical Therapy and Human Movement Science; Northwestern Feinberg School of Medicine; Chicago IL 60611 USA