Mechanisms of Space Constancy
The problem of space constancy despite movements of the eye is one of information selection. The perceptual system is concerned with the identification of objects, faces, letters of the alphabet, etc., and must be independent of changes in the retinal image that accompany saccadic eye movements. At the same time, the perceptual system must know with great sensitivity about displacements of objects in the world. A space constancy system, therefore, must null retinal information about eye movements while preserving information about movement in the world. Properties of the image that specify events in the world must be processed, while those that specify properties of retinal motion itself must be eliminated.
KeywordsRetinal Image Motion Perception Visual World Space Constancy Displacement Ratio
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