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. 2017 Dec 8;7:17252. doi: 10.1038/s41598-017-17429-4

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© The Author(s) 2017

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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Experiment 2 results. (A) Point of subjective equality (PSE) plotted as a function of number magnitude. There was a significant negative linear relationship between PSE and number magnitude, indicated by the regression line. A separate control group, indicated by the open circle, performed the same task using a white noise stimulus rather than numbers. The controls had a PSE approximately midway between the numbers 1 and 9. (B) Psychometric functions of “% right” judgments as a function of sound location. For illustration numbers are shown in three groups (1–3, 4–6, 7–9), as well as the white noise control group. The 50% PSE is indicated by a horizontal dotted line. (C) Sequence effects are shown by plotting “percent right” judgments as a function of the location of the previous number. There was a significant effect of sequence as judgments were inversely related to the location of the previous number. (D) Reaction time vs. sound location. There was a significant distance effect, indicated by progressive reductions in reaction time as sound location was farther from the midline.