Two-dimensional filtering,oriented line detectors,and figural aspects as determinants of visual illusions |
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Authors: | E. G. J. Eijkman H. J. Jongsma J. Vincent |
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Affiliation: | 1. University of Nijmegen, Nijmegen, The Netherlands
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Abstract: | Quantitative data of Müller-Lyer illusions from the literature were analyzed according to three different models. All three models predict the illusion effect, although with different magnitude and different parameter dependency. First, a filter model describing a certain amount of blurring of the retinal picture seems partly responsible for the observed illusion. With reasonable estimation of the filter constants, however, a sufficient magnitude of illusion cannot be obtained. A second model of oriented line or bar receptors is even less effective in explaining the observed length illusions. A third model, consisting of a size-constancy operator triggered by depth cues, may predict effects larger than actually observed. It is concluded that figural aspects such as depth-inducing cues are mainly responsible for the illusion effects observed in Müller-Lyer figures. |
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