Factors affecting the magnitude of the Ponzo perspective illusion among the Baganda |
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Authors: | Philip L. Kilbride Herschel W. Leibowitz |
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Affiliation: | 1. Bryn Mawr College, 19010, Bryn Mawr, Pennsylvania 2. The Pennsylvania State University, 16802, University Park, Pennsylvania
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Abstract: | The magnitude of the Ponzo perspective illusion, utilizing stimuli with varying amounts of context, was determined for a population of Ugandan villagers. The subjects were classified as two-dimensional, three-dimensional, or mixed perceivers based upon their verbal responses to photographs portraying symbolic depth cues. The illusion magnitude among those subjects classified as three-dimensional was similar to that of college observers who demonstrate an increase in illusion magnitude with increasing background context. The two-dimensional observers’ responses were similar to those of villagers tested previously, showing no significant increase for the same conditions. The role of two-dimensional flatness cues was eliminated on the basis of a control experiment. The data are interpreted as reflecting the operation of a. cognitive factor determining responsiveness to symbolic depth cues in two-dimensional reproductions. |
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