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. 2012 Aug 1;279(1744):4042–4050. doi: 10.1098/rspb.2012.1470

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This journal is © 2012 The Royal Society

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Females' responses to playbacks of close affiliates' and non-affiliates' alarm calls. The responses are expressed as the difference between subjects' response in the affiliate condition minus their response in the non-affiliate condition. (a) Overall orientation time towards the speaker: a positive difference indicates a longer orienting response in the affiliate condition compared with the non-affiliate condition. (b) Latency to react to the alarm calls being played back: a negative difference indicates a shorter latency to react to the alarm calls of a close affiliate. (c) Latency to approach the speaker: a negative difference indicates a shorter latency to approach the speaker when the calls of a close affiliate are being played back.