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What is it?

Many of the neurones in the visual part of the brain respond specifically to edges orientated in a certain direction. From this, the brain builds up the shape of an object. Information about the features on the surface of an object, like colour and shading, provide further clues about its identity. Objects are probably recognised mostly by their edges, and faces by their surface features.

Your brain helps you see faces and objects.
Your brain helps you see faces and objects.
Photodisc / Corbis

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