Abstract
Ss viewed trapezoids and made absolute judgments of their degree of tilt around a vertical axis. The trapezoids were equal in horizontal length but the ratio of their vertical edges was 15:16 or 13:16. The height in the frontal plane of the midpoint of the shorter vertical edge varied from above (positive) to below (negative) the midpoint height of the longer vertical edge. Two extremes in the type of function to expect were predicted on the basis of past experimentation and geometric considerations. It was found that as the relative midpoint height went from negative to positive, perceived tilt increased linearly except for a brief reversal in the 15:16 condition. Perceived tilt was shown to be greater, but with some overlap, for the 13:16 trapezoids.
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