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. 2020 Apr 29;11:817. doi: 10.3389/fpsyg.2020.00817

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Copyright © 2020 Tsuchiya, Ora, Hao, Ono, Sato, Kameda and Miyake.

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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(A) The attached placement of infrared reflection markers. (B) Left: Original video frame recorded in present experiment. Right: A frame reconstructed by the 3D coordinates of the infrared reflection markers. Participant A is shown as a red square and participant B is shown as a blue square. (C) Time series data of head movement. This was calculated as the sum of squared speed of the four markers attached to each participant’s head in each frame. The vertical axis is the sum of squared speed, and the horizontal axis is the frame. Using this data, we analyzed body movement synchrony.