March 18, 2012 7:51 PM

Face Blindness: When everyone is a stranger

Lesley Stahl: Yeah.

Jo Livingston: It made me realize, "How many times have I done this?"

Lesley Stahl: Right. How many friends have you offended? How many people aren't talking to you and you don't know why?

Jo Livingston: And we'll never know.

Oliver Sacks: People do think you may be snubbing them or stupid, or mad, or inattentive. That's why it's so important to recognize what one has. And to admit it.

Which is exactly what Sacks himself has just done -- written about the fact that he too is face blind.

[Oliver Sacks: I have had difficulty recognizing faces for as long as I can remember. My problem extends not only to my nearest and dearest, but also to myself. ]

Oliver Sacks: I've sometimes had the experience of apologizing to someone, and realizing it's a mirror.

Lesley Stahl: No.

Oliver Sacks: I have indeed.

Lesley Stahl: No. Because you didn't know it was you?

Oliver Sacks: I could see that it was a large, clumsy man with a beard. Now, I've now found a way of dealing with this. I have one special feature. I have rather large ears. If the large, clumsy man with a beard has extra large ears, it's probably me.

Lesley Stahl: I shouldn't be smiling, but it's funny.

Oliver Sacks: Well, it is. I mean, these things are both comic and serious.

And, surprisingly common. Recent studies show as many as 1 in 50 people may be face blind. And the search is on for clues inside their brains. We'll show you what the research is finding, plus, would you believe, super-recognizers...

Jennifer Jarett: I would say Mike Wallace.

Lesley Stahl: That is Mike Wallace!

...who never forget a face...

Jennifer Jarett: I don't even know how to get rid of people.

...when we come back.

No one knows what causes lifelong face blindness. It was discovered so recently, scientists are just beginning to unravel its secrets. And some of the clues are coming from people who once had normal face recognition, but lost it after suffering damage to part of the brain. And in an interesting twist, those people are also offering insight into the way the rest of us recognize faces. Imagine waking up after a trauma and not being able to recognize the people closest to you -- that's what happened to Colleen Castaldo.



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