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. 2018 Feb 1;8:2027. doi: 10.1038/s41598-018-20200-y

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Tilt illusion task and results. (a) Shows an example trial from the staircase procedure which first measured orientation discrimination threshold. Participants indicated whether the stimulus in the second interval appeared clockwise or anti-clockwise relative to the stimulus in the first interval. (b) Shows a trial in the two alternative forced choice measurement of the tilt illusion magnitude. On each trial, participants indicated whether the central stimulus in the second interval, compared with the central stimulus in the first interval, appeared clockwise or anti-clockwise. (c) The tilt illusion magnitude did not differ between cultures. Error bars show s.e.m.