oliver saks may be a world-famous neurologist. but there's one simple thing, something important, something most of us take for granted that he can barely do at all. that's to recognize a face. even a famous one. >> this one. soft focus. the owner of this face is looking tough. but i -- i don't know who it is. sometimes i fail to recognize myself. >> even yourself? >> yes, i have occasionally started apologizing to a clumsy bearded man, only to realize that this is a mirror. >> he's face-blind. it's a rare and incurable condition that he's had since birth. saks suspects it's genetic since his brother suffers from the same condition. he can see each facial feature just fine, but putting it all together, that's the problem. >> how about this picture? >> that is very beautiful. a model or an actress. well, i suppose one thinks of marilyn monroe. >> i'm curious. you're looking at me right now. can you describe what you're