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Perceiving in DepthVolume 3 Other Mechanisms of Depth Perception$
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Ian P. Howard

Print publication date: 2012

Print ISBN-13: 9780199764167

Published to Oxford Scholarship Online: May 2012

DOI: 10.1093/acprof:oso/9780199764167.001.0001

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Constancies in visual depth perception

Constancies in visual depth perception

(p.122) 29 Constancies in visual depth perception
Perceiving in Depth

Ian P. Howard

Oxford University Press

Perceptual constancy refers to the ability to perceive a constant feature of the world when the proximal stimulus is not constant. For example, we can perceive the size of an object in spite of the fact that the size of its retinal image varies with distance. Size constancy breaks down in the moon illusion. We can perceive a shape in spite of the fact that the retinal image changes when the shape is inclined. We can also judge that the linear speeds of two objects at different distances are the same when the speeds of their retinal images are not the same. This chapter reviews experiments on factors that determine the degree to which size constancy, shape constancy, and speed constancy are achieved.

Keywords:   size constancy, shape constancy, moon illusion, speed constancy

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