Carl Senior is University Lecturer in Psychology and a member of the Neurosciences Research Institute at Aston University, Birmingham, U.K. Tamara Russell is Postdoctoral Research Fellow at the Institute of Psychiatry, King's College, London. Michael S. Gazzaniga is Professor of Psychology and Director for the SAGE Center for the Study of Mind at the University of California, Santa Barbara. In addition, he is the Director of the Summer Institute in Cognitive Neuroscience, President of the Cognitive Neuroscience Institute, and a member of the President's Council on Bioethetics.