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. 2013 Dec 19;7:196. doi: 10.3389/fnbeh.2013.00196

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Copyright © 2013 De Groof, Poirier, George, Hausberger and Van Der Linden.

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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Sonograms of the stimuli used in the experiment. Stimuli were divided according to the level of social information that they convey: stimuli bearing species-specific and group information consisted of 2 species-specific whistles and 2 species-specific warbling motifs; stimuli bearing individual information consisted of 2 individual whistles and 2 individual warbling motifs. Artificial nonspecific stimuli consisted of pure tones (1, 3, 5, and 7 kHz). The depicted sequence of songs or sounds (AABB) was repeated four times per stimulus, bringing the total length of each stimulus to 16 s.