osed to know who they are... >> tim mcdonough: i usually just say, you know, "hi, nice to see you." >> stahl: so, you... you sometimes pretend. >> mcdonough: yeah.t. >> mcdonough: i fake it, yeah. >> so, you think it's not your mom? your mom.king with the harvard team to see if they can help him learn to recognize his mother's face.om or not? we could start at the top. we could do eyebrows, eyes,use the cheeks there. >> stahl: it's part of a pilot program to see if face blindness. >> mcdonough: this one's a little bit harder. >> stahl: so far, it's not. >> mcdonough: i don't know.at nobody tries to talk to me because, if they do, they... >> stahl: they want to talk done with them or something. >> mcdonough: yeah, and i don't know who they are. >> stahl: so it must be really. >> mcdonough: it is, yeah. takes me a while to make friends.ing friends can be tricky at both ends of the face recognition spectrum. ike >> jarett: i would see someone,later at a party and people would say, "oh, do you know each other?" and i'd say, "yes." and the other person would say, "no." and i'd say, "no, do