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velocity constancy


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A form of perceptual constancy according to which if an object is moving with constant velocity its perceived velocity also remains constant despite changes in the velocity of its images on the viewer's retinas, as when a viewer standing by the side of a road watches a car approaching at constant speed, the retinal image moves slowly when the car is far away and much more rapidly as it passes the viewer, and movements of the viewer's eyes add erratic movements to the retinal images, but the viewer nevertheless perceives the car moving at a constant speed.

Subjects: Psychology.


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