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. 2019 Feb 14;9:2107. doi: 10.1038/s41598-018-37786-y

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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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Grand-averaged ERP waveforms of Happy and Neutral conditions. (A) Group-averaged (n = 19) event related potential (ERP) waveforms of the two experimental conditions (Happiness and Neutral), superimposed across the 110 recording channels (e1-Cz). (B) Group-averaged (n = 19) Face_2-locked ERP waveforms recorded at left, midline and right scalp sites (frontal: F3, Fz, F4; central: C3, Cz, C4; parieto-occipital: PO3, POz, PO4) and at left and right occipito-temporal scalp sites (P9, P10), plotted as voltage in µv and as function of time in ms (Face_2: 0 ms). Black: Neutral; light blue: Happiness.