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. 2020 Feb 12;10:2435. doi: 10.1038/s41598-020-59102-3

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© The Author(s) 2020

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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Individual and mean (grey bars) percent correct responses for the letter recognition in static, and drawing conditions across constant and adjusted intensity experiments. Performance is well above chance (horizontal dashed line: 1/26) for all conditions and participants. There was no difference in recognition performance between constant and adjusted intensity experiments. Increasing intensity at the back of the tongue where sensitivity is lower did not improve the recognition performance.