Phenomenal Shape as a Function of Ambiguity of Contour Perspective

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Os made outline drawings of the apparent shapes of a rectangle and three trapezoids, exposed under reduced viewing conditions at slant of 10°, 25°, and 40°. The four forms were of equal height and area. The smallest projective angular convergence of the sides of the frontal-parallel trapezoids was larger than that of the rectangle at its maximum slant. Os distinguished significantly between forms and angles of slant. The shape indices for the monocular and binocular groups did not differ significantly, and the interaction between eye(s) and form was not significant. The data were interpreted, with those of a similar experiment on slant (Smith, 1966a) as supporting a formulation of the shape-slant relation in which phenomenal shape is primary, phenomenal slant subsidiary.

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