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. 2019 Dec 16;9:19217. doi: 10.1038/s41598-019-55705-7

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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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Frontal ERP Old/New effect reflecting familiarity. (A) Grand-averaged waveforms at representative frontal cluster for correctly recognized old and new trustworthy and untrustworthy faces. The shaded area represents the early (350–550 ms) time window used for the analyses. (B) ERP Old/New difference of the mean amplitudes and scalp topographies of the ERP difference (350–550 ms) for trustworthy and untrustworthy faces.