September 2019
Volume 19, Issue 10
Open Access
Vision Sciences Society Annual Meeting Abstract  |   September 2019
When illusions merge
Author Affiliations & Notes
  • Aline F. Cretenoud
    Laboratory of Psychophysics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
  • Michael H. Herzog
    Laboratory of Psychophysics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
Journal of Vision September 2019, Vol.19, 95. doi:https://doi.org/10.1167/19.10.95
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      Aline F. Cretenoud, Michael H. Herzog; When illusions merge. Journal of Vision 2019;19(10):95. doi: https://doi.org/10.1167/19.10.95.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Recently, we found very weak correlations between the magnitudes of visual illusions. However, we found strong correlations between 19 variants of the Ebbinghaus illusion which differed in color, shape or texture, suggesting that different illusions make up their own factors (e.g., an “Ebbinghaus factor”). Here, we asked whether the magnitude of a combination of two illusions is predicted by the basic illusions of the combined illusion. For example, we tested the Müller-Lyer and Ponzo illusions, as well as a combined version of both of them by adding inward and outward fins to the horizontal lines of the Ponzo illusion. A large sample (N = 100) with age ranging from 8 to 81 years was tested with an adjustment task. A regression model showed that the combined illusions were strongly predicted by the basic illusions. In addition, age does not seem to influence the illusory effects. We suggest that in the combined illusions no factor is lost, no factor is created, factors are not even transformed but just additive.

Acknowledgement: The project was funded by Swiss National Science Foundation (SNSF), project “Basics of visual processing: from elements to figures” (n° 320030_176153 / 1). 
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