PERCEPTION OF SHAPE AS A FUNCTION OF ORDER OF ANGLES OF SLANT.
DEFENCE RESEARCH MEDICAL LABS TORONTO (ONTARIO)
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24 Os viewed a rectangle and a triangle binocularly under reduced viewing conditions. The forms were shown in the frontal-parallel plane and at slants of 15, 30, 45, and 60 degrees in random, increasing and decreasing order of angles. Os judged shape by matching and by drawing. There was more constancy for decreasing order than for increasing order. The results for random order were inconclusive. The differences between the indices for drawing and matching were, in general, not significant. The rectangle produced more constancy than the triangle, especially at large slants. The series effect was contrary to prediction based on Helmholtzian and Gestaltist interpretations of the relation between phenomenal slant and phenomenal shape and was interpreted as consistent with adaptation-level theory on the assumption that the focal stimuli affected responses more than the residual stimuli. Author