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Humans identify negative （but not positive） arousal in silver fox vocalizations： implications for the adaptive value of interspecific eavesdropping

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Current Zoology 2017年第4期63卷 445-456页

作者： Piera FILIPPI Svetlana S. GOGOLEVA Elena V. VOLODINA Ilya A. VOLODIN Bart de BOER Artificial Intelligence Laboratory Department of Computer Science Faculty of Science Vrije Universiteit Brussel Pleinlaan 2 1050 Brussels Belgium Brain and Language Research Institute Aix-Marseille University Avenue Pasteur 5 13604 Aix-en-Provence France Max Planck Institute for Psycholinguistics Department of Language and Cognition Wundtlaan 1 6525 XD Nijmegen The Netherlands Department of Vertebrate Zoology Faculty of Biology Lomonosov Moscow State University Vorobievy Gory 1/12 119991 Moscow Russia Scientific Research Department Moscow Zoo B. Gruzinskaya 1 123242 Moscow Russia

The ability to identify emotional arousal in heterospecific vocalizations may facilitate behaviors that increase survival opportunities. Crucially, this ability may orient inter-species interactions, par- ticularly between humans and other species. Research shows that humans identify emotional arousal in vocalizations across multiple species, such as cats, dogs, and piglets. However, no previ- ous study has addressed humans＂ ability to identify emotional arousal in silver foxes. Here, we adopted low- and high-arousal calls emitted by three strains of silver fox--Tame, Aggressive, and Unselected--in response to human approach. Tame and Aggressive foxes are genetically selected for friendly and attacking behaviors toward humans, respectively. Unselected foxes show aggres- sive and fearful behaviors toward humans. These three strains show similar levels of emotional arousal, but different levels of emotional valence in relation to humans. This emotional information is reflected in the acoustic features of the calls. Our data suggest that humans can identify high- arousal calls of Aggressive and Unselected foxes, but not of Tame foxes. Further analyses revealed that, although within each strain different acoustic parameters affect human accuracy in identifying high-arousal calls, spectral center of gravity, harmonic-to-noise ratio, and F0 best predict humans＇ ability to discriminate high-arousal calls across all strains. Furthermore, we identified in spectral center of gravity and F0 the best predictors for humans＇ absolute ratings of arousal in each call. Implications for research on the adaptive value of inter-specific eavesdropping are discussed.

关键词： eavesdropping emotional arousal emotional valence inter-species communication silver foxes vocal communication.

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