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. 2017 Aug 10;7:7782. doi: 10.1038/s41598-017-07563-4

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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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Temporal sequence of the presentation of human facial expressions. Each stimulus consisted of two portrayal pictures and was presented for 3000 ms, followed by a fixation stimulus (500 ms), before the next stimulus appeared. For human facial expressions, each stimulus (from FACES⁶³), consisted of two pictures of the same individual showing two different out of four facial expressions (fear, anger, happiness, or neutral).