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Humans recognize affective cues in primate vocalizations: Acoustic and phylogenetic perspectives

View ORCID ProfileC. Debracque, Z. Clay, D. Grandjean, T. Gruber
doi: https://doi.org/10.1101/2022.01.26.477864
C. Debracque
1Department of Psychology and Educational Sciences and Swiss Center for Affective Sciences, University of Geneva, Geneva, Switzerland
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  • For correspondence: Coralie.Debracque@unige.ch
Z. Clay
2Department of Psychology, Durham University, Durham, United Kingdom
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D. Grandjean
1Department of Psychology and Educational Sciences and Swiss Center for Affective Sciences, University of Geneva, Geneva, Switzerland
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T. Gruber
1Department of Psychology and Educational Sciences and Swiss Center for Affective Sciences, University of Geneva, Geneva, Switzerland
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Abstract

Humans are adept in extracting affective information from the vocalisations of not only humans but also other animals. Current research has mainly focused on phylogenetic proximity to explain such cross-species emotion recognition abilities. However, because research protocols are inconsistent across studies, it remains unclear whether human recognition of vocal affective cues of other species is due to cross-taxa similarities between acoustic parameters, the phylogenetic distances between species, or a combination of both. To address this, we first analysed acoustic variation in 96 affective vocalizations, including agonistic and affiliative contexts, of humans and three other primate species – rhesus macaques, chimpanzees and bonobos – the latter two being equally phylogenetically distant from humans. Using Mahalanobis distances, we found that chimpanzee vocalizations were acoustically closer to those of humans than to those of bonobos, confirming a potential derived vocal evolution in the bonobo lineage. Second, we investigated whether 68 human participants recognized the affective basis of vocalisations through tasks by asking them to categorize (‘A vs B’) or discriminate (‘A vs non-A’) vocalisations based on their affective content. Results showed that participants could reliably categorize and discriminate most of the affective vocal cues expressed by other primates, except threat calls by bonobos and macaques. Overall, participants showed greatest accuracy in detecting chimpanzee vocalizations; but not bonobo vocalizations, which provides support for both the phylogenetic proximity and acoustic similarity hypotheses. Our results highlight for the first time the importance of both phylogenetic and acoustic parameter level explanations in cross-species affective perception, drawing a more complex picture to explain our natural understanding of animal signals.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • ↵± joint co-senior authors

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted January 27, 2022.
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Humans recognize affective cues in primate vocalizations: Acoustic and phylogenetic perspectives
C. Debracque, Z. Clay, D. Grandjean, T. Gruber
bioRxiv 2022.01.26.477864; doi: https://doi.org/10.1101/2022.01.26.477864
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Humans recognize affective cues in primate vocalizations: Acoustic and phylogenetic perspectives
C. Debracque, Z. Clay, D. Grandjean, T. Gruber
bioRxiv 2022.01.26.477864; doi: https://doi.org/10.1101/2022.01.26.477864

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