Michael S. Gazzaniga is the Director of the Sage Center for the study of Mind at the University of California, Santa Barbara. He received his Ph.D. from the California Institute of Technology, where he worked with Roger Sperry, and had primary responsibility for initiating human split-brain research. He has established Centers for Cognitive Neuroscience at Cornell Medical School, the University of California, Davis, and at Dartmouth. He is founder of the Cognitive Neuroscience Institute and founding editor of the Journal of Cognitive Neuroscience. He was a member of the President's Council on