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How do you see?

When you look at an object, electrical signals travel via the optic nerves to an area in your brain called the thalamus. This then sends the information to the visual cortex, where it is examined in detail. Different parts of the visual cortex simultaneously process the colour, shape, movement and depth of the object. Other parts of the cortex put this information together to give you a complete picture of the object.

A 'map' of the visual cortex: the colours show which direction the neurones respond to best.
A 'map' of the visual cortex: the colours show which direction the neurones respond to best.
David Fitzpatrick, Duke University Medical Center

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