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. 2021 Sep 15;15:624610. doi: 10.3389/fnhum.2021.624610

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Copyright © 2021 Lübbert, Göschl, Krause, Schneider, Maye and Engel.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Coordination dynamics in social interaction. (A) Experimental setup. Participants were seated opposite to each other and instructed to move their index finger up and down continuously, either with eyes open or eyes closed in separate periods. Importantly, no specific instructions about the coordination of the finger movements were given. (B) (Top) Relative phase of the finger movements, indicating synchrony when participants had their eyes open and were viewing each other’s movements. (Middle) Occurrence of relative phase lags of movements. With eyes open, zero phase lag dominated the distribution. (Bottom) With eyes open, participants adopted the same movement frequency; of note, movement frequencies remained similar when participants closed their eyes again. Modified from Oullier et al. (2008).