The hydra-headed Mueller-Lyer effect: A theoretical puzzle |
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Authors: | Alexander W Pressey Alexander E Wilson |
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Institution: | 1. University of Manitoba, R3T2N2, Winnipeg, Manitoba, Canada
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Abstract: | Three experiments were conducted to examine the effects of multiple fins on the magnitude of the Mueller-Lyer illusion. All studies showed that the multiple form of the elongation illusion was greater than the average of the components and that the multiple form of the shrinkage illusion was smaller than either of the components. The pattern of results failed to support either simple addition models or more complex averaging theories of illusions. A cross-attribute summation hypothesis and a filled space hypothesis were proposed as possible explanations for the results. |
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