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. 2015 Sep 28;6:1416. doi: 10.3389/fpsyg.2015.01416

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Copyright © 2015 Henry, Craig, Lemasson and Hausberger.

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) or licensor 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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Interval separating two successive whistles produced by two different individuals (overlap: when two whistles overlap). The arrow indicated a break in the interactions after a 2 s delay.