E-Mail IMAGE: The visual centers in those seeing a film or imagining as instructed had similar timing in their brain activity, while those experiencing spontaneous hallucinations showed a gradual increase in slow... view more Credit: The Weizmann Institute of Science Some people have lost their eyesight, but they continue to "see." This phenomenon, a kind of vivid visual hallucination, is named after the Swiss doctor, Charles Bonnet, who described in 1769 how his completely blind grandfather experienced vivid, detailed visions of people, animals and objects. Charles Bonnet syndrome,...