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Home / Equine Research Bank / Sci Rep / Vocal expression of emotional valence in Przewalski’s ...
Scientific reports2017; 7(1); 8779; doi: 10.1038/s41598-017-09437-1

Vocal expression of emotional valence in Przewalski’s horses (Equus przewalskii).

Abstract: Vocal expression of emotions has been suggested to be conserved throughout evolution. However, since vocal indicators of emotions have never been compared between closely related species using similar methods, it remains unclear whether this is the case. Here, we investigated vocal indicators of emotional valence (negative versus positive) in Przewalski's horses, in order to find out if expression of valence is similar between species and notably among Equidae through a comparison with previous results obtained in domestic horse whinnies. We observed Przewalski's horses in naturally occurring contexts characterised by positive or negative valence. As emotional arousal (bodily activation) can act as a confounding factor in the search for indicators of valence, we controlled for its effect on vocal parameters using a behavioural indicator (movement). We found that positive and negative situations were associated with specific types of calls. Additionally, the acoustic structure of calls differed according to the valence. There were some similarities but also striking differences in expression of valence between Przewalski's and domestic horses, suggesting that vocal expression of emotional valence, unlike emotional arousal, could be species specific rather than conserved throughout evolution.
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Publication Date: 2017-08-18 PubMed ID: 28821880PubMed Central: PMC5562828DOI: 10.1038/s41598-017-09437-1Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research looks into whether different species of horses express emotion differently through vocal sounds. They particularly focused on the Przewalski’s horses, analyzing their vocal expressions during instances of both positive and negative valence. Their findings suggest that the expression of emotional valence, as opposed to emotional arousal, may not be evolutionary conserved, which contradicts previous assumptions.

Objectives and Methodology

  • The aim of this research was to glean more information about whether the vocal indications of emotions in different species, particularly among Equidae, are conserved or varied.
  • Przewalski’s horses were the main subjects of the study. Researchers observed these horses in organic contexts that were characterized by either positive or negative valence (the intrinsic attractiveness or averseness of an event, object, or situation).
  • To limit the effects of confounding factors such as emotional arousal (body activation), controls for vocal parameters were established using a behavioural indicator – the horse’s movement.

Findings

  • The researchers noted that positive and negative situations incited unique vocal responses from the horses.
  • They observed that the horse’s calls’ acoustic structure altered based on the situation’s valence.

Comparison with Previous Research

  • Upon comparison, results showed that while there were certain similarities, there were also striking differences in the expression of emotional valence between Przewalski’s horses and domestic horses. This suggests that the vocal indication of emotional valence may potentially be species-specific, rather than conserved through evolution.

Implications

  • This research challenges previous assumptions about vocal expressions of emotions being conserved through evolution.
  • It highlights the potential for different species to have unique, species-specific methods of vocalizing their emotional responses to positive or negative situations.
  • This informs future studies about vocal expressions of emotion, hinting at the necessity to consider the possibility of species-specific vocalizations.

Cite This Article

APA
Maigrot AL, Hillmann E, Anne C, Briefer EF. (2017). Vocal expression of emotional valence in Przewalski’s horses (Equus przewalskii). Sci Rep, 7(1), 8779. https://doi.org/10.1038/s41598-017-09437-1

Publication

Scientific reports
ISSN: 2045-2322
NlmUniqueID: 101563288
Country: England
Language: English
Volume: 7
Issue: 1
Pages: 8779
PII: 8779

Researcher Affiliations

Maigrot, Anne-Laure
  • Division of Animal Welfare, Veterinary Public Health Institute, Vetsuisse Faculty, University of Bern, Länggassstrasse 120, 3012, Bern, Switzerland. anne.maigrot@usys.ethz.ch.
  • Ethology and Animal Welfare Unit, Institute of Agricultural Sciences, ETH Zürich, Universitätstrasse 2, 8092, Zurich, Switzerland. anne.maigrot@usys.ethz.ch.
Hillmann, Edna
  • Ethology and Animal Welfare Unit, Institute of Agricultural Sciences, ETH Zürich, Universitätstrasse 2, 8092, Zurich, Switzerland.
Anne, Callista
  • Ethology and Animal Welfare Unit, Institute of Agricultural Sciences, ETH Zürich, Universitätstrasse 2, 8092, Zurich, Switzerland.
Briefer, Elodie F
  • Ethology and Animal Welfare Unit, Institute of Agricultural Sciences, ETH Zürich, Universitätstrasse 2, 8092, Zurich, Switzerland.

Conflict of Interest Statement

The authors declare that they have no competing interests.

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Citations

This article has been cited 12 times.
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