Stephen M. Kosslyn is the Chair of the Department of Psychology, John Lindsley Professor of Psychology at Harvard University, and Associate Psychologist in the Department of Neurology at the Massachusetts General Hospital.William L. Thompson received his BA in psychology from McGill University in 1990 and since then has worked in Stephen Kosslyn's laboratory in the Psychology Department at Harvard University.Giorgio Ganis is Assistant Professor in Radiology at the Harvard Medical School and Research Associate in Psychology at Harvard University.