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. 2019 May 24;48(7):638–641. doi: 10.1177/0301006619853147

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© The Author(s) 2019

Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Determining two illusions’ effects on perceived positions and sizes. (a) Ebbinghaus illusion with the first set of instructions. (b) The Ebbinghaus illusion affected judgments based on positions to a similar extent as those of size (diameter). (c) The modified diagonal illusion (right line seems longer due to the surrounding shape and additional white dots) with the second set of instructions. (d) The modified diagonal illusion only affected judgments of size (length). Text in (a) and (c) is not to scale. Error bars in (b) and (d) indicate 95% confidence intervals.