Following surgery, Peter, unlike most other split brain patients, was not able to respond with the left side of his body to verbal input. When asked to make whole body movements (e.g., Stand like a boxer ) or movements of the left side of his body (e.g., Touch your left ear with your left hand ), he could not respond correctly. Apparently, his left hemisphere could not, or would not, control the left side of his body via ipsilateral fibers. During such tests, Peter or, more specifically, Peter s left hemisphere often remarked that he hated the left side of his body.