Perceived Shape at a Slant as a Function of Processing Time

Abstract
Shape and slant judgments of rotated or frontoparallel ellipses were elicited from three groups of 10 subjects. A masking stimulus was introduced to control processing time. Backward masking trials were presented with interstimulus intervals of 0, 25, and 50 msec, Reduction of processing time altered shape judgments in the direction of projective shape and slant judgments in the direction of frontoparallelness. This finding is consistent with the shapeslant invariance hypothesis. In order to study the effects of processing load, one group of subjects was given prior knowledge of the kind of judgment..
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