CHAPTER Prediction of Muscle Activity from Cortical Signals to Restore Hand Grasp in Subjects with Spinal Cord Injury Department of 11 Emily R. Oby , Christian Ethier , Matthew J. Bauman , Eric J. Perreault , Jason H. Ko , Lee E. Miller Physiology, Department of Physical Medicine and Rehabilitation, Division of Plastic and Reconstructive Surgery, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, Department of Biomedical Engineering, Northwestern University, Evanston, Illinois