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This is Scientific Americans' 60-second science. I'm Erica Barris. Got a minute?

Ever wonder how the citizens of Metropolis somehow could not recognize Clark Kent once he ditched the glasses and became Superman?

Well, now there's an actual scientific explanation.

When a person alters their appearance, even in small ways like adding a pair of glasses, it can indeed lessen the ability of others who do not know that person to recognize his or her face.

The study is in the journal Applied Cognitive Psychology.

Psychologist Robin Kramer and Kay Ritchie from the University of York in the UK showed volunteers pictures of unknown people, not celebrities.

The photos came from Google images and featured people in various poses with different

facial expressions and changing lighting. The participants saw two photos at the same time,

either two pictures of the same person or a different person in each picture. Three possible pairs of pictures were presented.

Both people wore glasses, neither person wore glasses, or only one of the pair of people had glasses on.

Then the researchers asked the volunteers, whether the pictures were of the same person or of two different people.

When the folks in both pictures were in the same condition, either both with

glasses or both without, the participants were about 80% accurate in telling whether it was

the same person or a different person in the two picks. But accuracy felt to 74% when glasses were

worn in only one of the pictures. The researchers noted that the appearance of the eyes may be the most important

aspect of facial recognition, so a change to the eyes could be expected to reduce cognition.

But trained examiners, such as TSA agents, may be less fooled by such simple modifications.

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