Shape Perception Judgments as a Function of Stimulus Orientation, Stimulus Background, and Perceptual Style.
HUMAN RESOURCES RESEARCH ORGANIZATION ALEXANDRIA VA
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Two experiments tested the validity of the shape-slant invariance hypothesis. The first tests used two-dimensional rectangular stimuli to obtain shape judgment responses from 20 subjects. Individual differences between subjects were found to significantly influence shape judgement, but stimulus shape did not. In the second experiment, 68 subjects judged the shape and rotational orientation of three-dimensional rectangular solids. A statistical procedure was used to control this source of variance. Shape and rotation of the stimulus objects were found to influence judgments of shape and rotational orientation. Errors of judging stimulus shape and rotation were significantly correlated, as were the objective and projective stimulus shapes. These later results were interpreted as providing support for the shape-slant invariance hypothesis. Author