The perception of movement by young chimpanzees and human children.

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Abstract
Studies on the threshold for movement in different species have been reported by a few investigators (3, 4, 6, 7). In most of the previous work, however, the rate of movement of the stimulus to be perceived was measured in centimeters per second. The visual distance in most instances was not held constant so that rate of movement in terms of visual angle is unknown. Cross-species comparisons are further complicated by the large number of interacting variables which are important to the determination of movement thresholds (5) but which are almost never constant from experiment to experiment. The present investigation was designed to compare the lower thresholds for perception of movement obtained with the same apparatus and under similar conditions in young chimpanzees and human children. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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