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. 2019 Oct 30;9:15570. doi: 10.1038/s41598-019-51759-9

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© The Author(s) 2019

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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Bootstrap analysis comparing mean differences between “familiar” and “unfamiliar” responses from the main group to baseline difference distributions sampled from the control group (grey). As expected, difference distributions in the control group are centered around 0. Left upper insets show the respective electrode cluster overlaid on the ‘familiar – unfamiliar’ difference of the main group. In both clusters, responses observed in the main group (green dots) are well outside the baseline distributions (p < 0.001). Right upper inset figures show mean responses to “familiar” (blue dot) and “unfamiliar” (red dot) conditions from the main group, overlaid on distribution of responses from the control group (grey bars; collapsed across “familiar” and “unfamiliar”). Main group responses to both “familiar” and “unfamiliar” conditions are found on opposite sides of the control distributions, revealing a repulsive effect.