Visual agnosia is a rare and fascinating disorder of visual object recognition that can occur after a brain lesion. In this book Humphreys and Riddoch revisit the case of their patient John, over twenty years after it was originally described in To See But Not To See, in 1987. This fully updated new edition discusses John's case in the context of cutting-edge research into the cognitive neuroscience of vision. It will be of interest to researchers and students studying the cognitive neuroscience of vision.