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Last Updated: Wednesday, 10 June 2015 22:49

Written by Dr. Donald H. Mershon

Summary: Factors that determine the apparent arrangements of objects in space include many different sources of information (or cues). Often such information is plentiful. What should we expect, however, when information is limited – at long distances, when visibility is poor, or when we look through a restrictive aperture? Not surprisingly, our perceptions of depth will involve more mistakes. Such errors, however, are not random. Rather, a built-in bias leads to seeing less depth between objects than there is in actuality. Under the most limited of conditions, objects may appear the same distance away, despite their physical separations.

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