George Mather is Professor of Vision Science in the School of Psychology at the University of Lincoln. He has over twenty-five years of experience in teaching courses on human visual perception and the psychology of visual art to undergraduate and postgraduate students and is the author of Essentials of Sensation and Perception (2011), Foundations of Sensation and Perception (2009) and The Motion After-Effect: A Modern Perspective (1998, co-edited with Stuart Anstis and Frans Verstraten).