Oliver Sacks book: "An Anthropologist on Mars" covered a case of this happening. There is an interesting writeup with some background at: http://faculty.washi

Oliver Sacks book: "An Anthropologist on Mars" covered a case of this happening. There is an interesting writeup with some background at: http://faculty.washington.edu/chudler/visblind.html http://faculty.washington.edu/chudler/visblind.html