Abstract
Walk's (1965) assumption that motion parallax is “the critical cue” for depth discrimination by newly hatched chicks was assessed by the use of 3-dimensional striped patterns on each side of the centerboard. The 3-dimensional patterns served two purposes: (1) to test an hypothesis that chicks would show no significant preference for the “shallow” side if motion parallax cues were presented independent of the solid appearance furnished by 2-dimensional surfaces and (2) to permit direct manipulation of the stimulus basis for motion parallax. Ss were 250 chicks, 6 to 24 hr. old. Results provide evidence that stimuli for motion parallax, devoid of the solid appearance of 2-dimensional surfaces, are sufficient cues for depth discrimination by chicks.
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