jacob hodes is one of them. has a college degree, has had great jobs, and he seems perfectly normal. just don't ask him to identify any faces... we're going to put up the first one. ...even very famous ones. >> jacob hodes: no idea. we showed jacob faces without hair, a pure test of facial recognition. >> hodes: no. nope. i can't say if i've ever seen that person. >> stahl: he's seen jimmy carter plenty of times. and knows michael jordan, too. >> hodes: oh, lord. >> stahl: he just can't recognize their faces. >> hodes: now, that's just impossible. >> stahl: can you describe my face? you're staring right at it. >> hodes: high cheekbones, light eyes. >> stahl: clearly, jacob could see my face, but he says if we happened to run into each other in a few days, he wouldn't know me from any other woman with short blonde hair. >> brad duchaine: they meet somebody, they have a good time with them, they have a nice relationship. then, a week later, they walk past them. >> stahl: brad duchaine is a professor at dartmouth c