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. 2019 Feb 28;9:3120. doi: 10.1038/s41598-019-40060-4

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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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(A) Zygomatic synchrony in two real dyads. Zygomatic EMG responses in two co-viewing dyads (dyad1- red colors, dyad 2 – blue colors) are presented. (B) Zygomatic synchrony in two random dyads. Zygomatic EMG responses in two random dyads, constructed from the (A) dyad members. (B) Average zygomatic synchrony in real and random dyads. Zygomatic synchrony was assessed in real dyads (i.e. participants who viewed the movies together, marked by full bars) and in random dyads (i.e. participants who viewed the same movies but not together, marked by patterned bars), during non-emotional baseline (grey), the negative movie (red) and the positive movie (green) conditions.