JEREMY M. WOLFE Professor of Ophthalmology at Harvard Medical School, USA. KEITH R. KLUENDER Professor of Psychology at the University of Wisconsin, Madison, USA. DENNIS M. LEVI has taught at the University of California, Berkeley, USA since 2001. LINDA M. BARTOSHUK Professor of Otolaryngology and Psychology at Yale University, USA. RACHEL S. HERZ Visiting Assistant Professor in the Department of Psychiatry and Human Behaviour at Brown University Medical School, USA. ROBERTA L. KLATZY Professor of Psychology at Carnegie Mellon University, USA, where she also holds faculty appointments in the Center for the Neural Basis of Cognition and the Humanï¿½Computer Interaction Institute. SUSAN J. LEDERMAN Professor of Psychology at Queen's University, USA, with cross-appointments in the School of Computing and in the Centre for Neuroscience.