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. 2017 Jan 9;7:39968. doi: 10.1038/srep39968

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(A) Correlation between illusory effects of geometrical illusions. Note the significant correlation between the Muller-Lyer and Ebbinghaus illusions. (B) Correlations between the illusory effects of the geometrical and the contrast illusions. The dots denote individual magnitude for corresponding illusion. The tendency lines were obtained as an ordinary least squares (OLS) fit. Statistical results are Rho of Spearman correlation, permutation p-values and 99.5% confidence interval using permutation analysis.