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. 2020 Apr 3;11:442. doi: 10.3389/fpsyg.2020.00442

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Copyright © 2020 Norscia, Zanoli, Gamba and Palagi.

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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Line plot of the effect of the sex of the trigger (X-axis) on acoustic yawn contagion mean occurrence (Y-axis). Effect of the trigger sex on acoustic yawn contagion when the responder is a female (right) and a male (left). Males’ yawns elicit more yawns than females’ ones regardless of the sex of the responder (result of the GLMM, p = 0.022). Points represent the effect that the response variable has on the independent variable “sex of the trigger,” based on the value predicted by the model. Colored bands show the 95% confidence interval.