are part of two neurophysiological mechanisms that are specialized in shape and object recognition and in spatial localization, respectively.

Binocular disparity

When attention is directed to a point F in space, automatic eye movements are performed, causing the eye to rotate and point F is mapped onto the point of the eye with which it can see most sharply, the fovea. The direction in which the eye then looks is called the principle ocular direction. Every other point in space is seen

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