Abstract
A classification system for visual-geometric illusions, based upon the interrelationships between behavioral responses to various distortions was created. Forty-five illusion configurations were presented to 221 observers. Factor analysis revealed that there are five classes of illusions. A secondorder analysis revealed that visual distortions are ultimately reducible to two global types of distortions: illlusions of extent and illusions of shape or direction.
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Girgus, J. S., & Coren, S.Contrast and assimilation illusions Differences in plasticity. Paper presented at the meeting of the Psychonomic Society, Denver, November. 1975.
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This research was supported in part by grants from the National Research Council of Canada (A9783) and the National Science Foundation (74-18599).
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Coren, S., Girgus, J.S., Erlichman, H. et al. An empirical taxonomy of visual illusions. Perception & Psychophysics 20, 129–137 (1976). https://doi.org/10.3758/BF03199444
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DOI: https://doi.org/10.3758/BF03199444