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Recognition at first glance
Date:7/1/2010

We meet a multitude of people on a daily basis: the nice waitress in the coffee shop around the corner, the bus driver or the colleagues at the office. Without the ability to recognize faces at first glance we would not be able to distinguish between people. Monkeys also possess the remarkable ability to differentiate faces of group members and to extract the relevant information about the individual directly from the face. With the help of the so called Thatcher illusion, scientists of the Max Planck Institute for Biological Cybernetics in Tbingen, Germany, have examined how people and macaque monkeys recognize faces and process the information in the brain. They found out that both species perceive the faces of their kin immediately, while the faces of the other species are processed in a different way.

"From an early age on we are accustomed to the faces of other humans: a long nose, the swing of the lips or the bushy eyebrows. We learn to recognize the small differences which contribute to an individual appearance", explains Christoph Dahl, researcher at the Max Planck Institute for Biological Cybernetics". It is similar in monkeys. They learn to recognize the features of their fellow monkeys (so called conspecifics) and can grasp the identity of every group member quickly. "However in humans, as well as in macaque monkeys, this principle only works with individuals of the same kind", says Dahl. Even though the recognition of conspecific faces is achieved by means of holistic processing, the separate parts such as mouth, nose and eyes as well as the facial proportions are still important. "Although we look at the eyes first our neural functions still grasp the whole picture", Christoph Dahl describes the processing mechanisms behind the facial recognition.

With the help of the "Thatcher illusion" the scientists examined the facial recognition of macaque monkeys and humans. Local changes in facial features are hardly noticeable when the
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Contact: Dr. Christoph Dahl
christoph.dahl@tuebingen.mpg.de
49-707-160-1610
Max-Planck-Gesellschaft
Source:Eurekalert  

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