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Animals : an open access journal from MDPI2019; 9(9); 630; doi: 10.3390/ani9090630

Are Horses (Equus caballus) Sensitive to Human Emotional Cues?

Abstract: Emotions are important for social animals because animals' emotions function as beneficial cues to identify valuable resources such as food or to avoid danger by providing environmental information. Emotions also enable animals to predict individuals' behavior and determine how to behave in a specific context. Recently, several studies have reported that dogs are highly sensitive to not only conspecific but also human emotional cues. These studies suggest that domestication may have affected such sensitivity. However, there are still few studies that examine whether other domesticated animals, in addition to dogs, exhibit sensitivity to human emotional cues. In this study, we used a gaze-following task to investigate whether horses () are sensitive to human emotional cues (happy, neutral, disgust) and if they adjust their behavior accordingly. In the study, the experimenter suddenly turned her head to either right or left and showed emotional cues. The results revealed that horses significantly decreased the frequency with which they followed the experimenter's gaze and the total looking time during the gaze-emotional cue presentation in the Disgust condition compared to the Neutral condition. These results suggest the possibility that horses are sensitive to human emotional cues and behave on the basis of the meaning implied by negative human emotional cues.
Publication Date: 2019-08-29 PubMed ID: 31470656PubMed Central: PMC6770165DOI: 10.3390/ani9090630Google Scholar: Lookup
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  • Journal Article

Summary

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The research article discusses a study exploring the sensitivity of horses to human emotions and whether these animals adjust their behavior relayed through these emotions. This study utilized a gaze-following task to gauge this sensitivity.

Research Objective

The objective of the research was to delve into the sensitivity of horses to human emotional cues. This focus was inspired by previous studies that indicated dogs’ high sensitivity to both their own species and human emotional cues. However, the study also aimed to investigate if this sensitivity results in a behavioral adjustment in horses.

Methodology

  • In this study, a gaze-following task was employed. This method essentially entails observing if an animal will follow the gaze of a human subject, in this case, an experimenter. This was used to investigate the sensitivity to the emotional cues.
  • The experimenter would suddenly move her head to either the right or left, showing varying emotional cues that included happiness, neutrality, or disgust.

Findings

The research found notable adjustments in the horses’ behavior depending on the emotional cues presented.

  • When the experimenter exhibited signs of disgust, the horses were less likely to follow her gaze. Furthermore, the duration of time that the horses spent looking during the ‘gaze-emotional cue’ presentation was significantly reduced compared to when the experimenter showed neutral emotions.
  • This significant decrease in frequency and total looking time suggests that horses are indeed sensitive to human emotional cues and re-adjust their behavior based on the implications of these cues, particularly negative ones.

Implications

These results imply that emotions don’t just play an important role in the social interactions of animals in their own environment, but they also extend to interactions between different species, in this case, humans and horses. This could lead to deeper explorations on the extent to which domestication has influenced an animal’s sensitivity to human emotions, informing better cross-species communication and interaction strategies.

Cite This Article

APA
Baba C, Kawai M, Takimoto-Inose A. (2019). Are Horses (Equus caballus) Sensitive to Human Emotional Cues? Animals (Basel), 9(9), 630. https://doi.org/10.3390/ani9090630

Publication

ISSN: 2076-2615
NlmUniqueID: 101635614
Country: Switzerland
Language: English
Volume: 9
Issue: 9
PII: 630

Researcher Affiliations

Baba, Chihiro
  • Department of Behavioral Science, Graduate School of Humanities and Human Sciences, Hokkaido University, Sapporo 060-0810, Japan.
Kawai, Masahito
  • Shizunai Livestock Farm, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0811, Japan.
Takimoto-Inose, Ayaka
  • Department of Behavioral Science, Graduate School of Humanities and Human Sciences, Hokkaido University, Sapporo 060-0810, Japan. atakimoto@let.hokudai.ac.jp.
  • Center for Experimental Research in Social Sciences, Hokkaido University, Sapporo 060-0808, Japan. atakimoto@let.hokudai.ac.jp.

Grant Funding

  • 15K20946 / Japan Society for the Promotion of Science
  • 18K18339 / Japan Society for the Promotion of Science
  • 26118004 / Japan Society for the Promotion of Science

Conflict of Interest Statement

The authors declare no conflict of interest.

References

This article includes 33 references
  1. Mendl M, Burman OHP, Parker RMA, Paul ES. Cognitive bias as an indicator of animal emotion and welfare: Emerging evidence and underlying mechanisms. Appl. Anim. Behav. Sci. 2009;118:161–181.
  2. Spoor JR, Kelly JR. The Evolutionary significance of affect in groups: Communication and group bonding. Gr. Process. Intergr. Relat. 2004;7:398–412.
    doi: 10.1177/1368430204046145google scholar: lookup
  3. Flack JC, de Waal FBM. ‘Any animal whatever’ Darwinian building blocks of morality in monkeys and apes. J. Conscious. Stud. 2000;7:1–29.
  4. Müller CA, Schmitt K, Barber AL, Huber L. Dogs can discriminate emotional expressions of human faces.. Curr Biol 2015 Mar 2;25(5):601-5.
    doi: 10.1016/j.cub.2014.12.055pubmed: 25683806google scholar: lookup
  5. Parr LA. Cognitive and physiological markers of emotional awareness in chimpanzees (Pan troglodytes).. Anim Cogn 2001 Nov;4(3-4):223-9.
    doi: 10.1007/s100710100085pubmed: 24777512google scholar: lookup
  6. Albuquerque N, Guo K, Wilkinson A, Savalli C, Otta E, Mills D. Dogs recognize dog and human emotions.. Biol Lett 2016 Jan;12(1):20150883.
    doi: 10.1098/rsbl.2015.0883pmc: PMC4785927pubmed: 26763220google scholar: lookup
  7. Wathan J, Proops L, Grounds K, McComb K. Horses discriminate between facial expressions of conspecifics.. Sci Rep 2016 Dec 20;6:38322.
    doi: 10.1038/srep38322pmc: PMC5171796pubmed: 27995958google scholar: lookup
  8. Russell CL, Bard KA, Adamson LB. Social referencing by young chimpanzees (Pan troglodytes).. J Comp Psychol 1997 Jun;111(2):185-93.
    doi: 10.1037/0735-7036.111.2.185pubmed: 9170283google scholar: lookup
  9. Nagasawa M, Murai K, Mogi K, Kikusui T. Dogs can discriminate human smiling faces from blank expressions.. Anim Cogn 2011 Jul;14(4):525-33.
    doi: 10.1007/s10071-011-0386-5pubmed: 21359654google scholar: lookup
  10. Merola I, Prato-Previde E, Marshall-Pescini S. Social referencing in dog-owner dyads?. Anim Cogn 2012 Mar;15(2):175-85.
    doi: 10.1007/s10071-011-0443-0pubmed: 21874515google scholar: lookup
  11. Buttelmann D, Tomasello M. Can domestic dogs (Canis familiaris) use referential emotional expressions to locate hidden food?. Anim Cogn 2013 Jan;16(1):137-45.
    doi: 10.1007/s10071-012-0560-4pubmed: 22960805google scholar: lookup
  12. Hare B, Brown M, Williamson C, Tomasello M. The domestication of social cognition in dogs.. Science 2002 Nov 22;298(5598):1634-6.
    doi: 10.1126/science.1072702pubmed: 12446914google scholar: lookup
  13. Freedman AH, Gronau I, Schweizer RM, Ortega-Del Vecchyo D, Han E, Silva PM, Galaverni M, Fan Z, Marx P, Lorente-Galdos B, Beale H, Ramirez O, Hormozdiari F, Alkan C, Vilà C, Squire K, Geffen E, Kusak J, Boyko AR, Parker HG, Lee C, Tadigotla V, Wilton A, Siepel A, Bustamante CD, Harkins TT, Nelson SF, Ostrander EA, Marques-Bonet T, Wayne RK, Novembre J. Genome sequencing highlights the dynamic early history of dogs.. PLoS Genet 2014 Jan;10(1):e1004016.
  14. Merola I, Prato-Previde E, Lazzaroni M, Marshall-Pescini S. Dogs' comprehension of referential emotional expressions: familiar people and familiar emotions are easier.. Anim Cogn 2014 Mar;17(2):373-85.
    doi: 10.1007/s10071-013-0668-1pubmed: 23955027google scholar: lookup
  15. Hare B, Tomasello M. Human-like social skills in dogs?. Trends Cogn Sci 2005 Sep;9(9):439-44.
    doi: 10.1016/j.tics.2005.07.003pubmed: 16061417google scholar: lookup
  16. Maros K, Gácsi M, Miklósi A. Comprehension of human pointing gestures in horses (Equus caballus).. Anim Cogn 2008 Jul;11(3):457-66.
    doi: 10.1007/s10071-008-0136-5pubmed: 18247069google scholar: lookup
  17. Nawroth C, Ebersbach M, von Borell E. Juvenile domestic pigs (Sus scrofa domestica) use human-given cues in an object choice task.. Anim Cogn 2014 May;17(3):701-13.
    doi: 10.1007/s10071-013-0702-3pubmed: 24197275google scholar: lookup
  18. Outram AK, Stear NA, Bendrey R, Olsen S, Kasparov A, Zaibert V, Thorpe N, Evershed RP. The earliest horse harnessing and milking.. Science 2009 Mar 6;323(5919):1332-5.
    doi: 10.1126/science.1168594pubmed: 19265018google scholar: lookup
  19. Proops L, McComb K. Attributing attention: the use of human-given cues by domestic horses (Equus caballus).. Anim Cogn 2010 Mar;13(2):197-205.
    doi: 10.1007/s10071-009-0257-5pubmed: 19588176google scholar: lookup
  20. Takimoto A, Hori Y, Fujita K. Horses (Equus caballus) adaptively change the modality of their begging behavior as a function of human attentional states. Psychologia 2016;59:100–111.
    doi: 10.2117/psysoc.2016.100google scholar: lookup
  21. Smith AV, Proops L, Grounds K, Wathan J, McComb K. Functionally relevant responses to human facial expressions of emotion in the domestic horse (Equus caballus).. Biol Lett 2016 Feb;12(2):20150907.
    doi: 10.1098/rsbl.2015.0907pmc: PMC4780548pubmed: 26864784google scholar: lookup
  22. Proops L, Grounds K, Smith AV, McComb K. Animals Remember Previous Facial Expressions that Specific Humans Have Exhibited.. Curr Biol 2018 May 7;28(9):1428-1432.e4.
    doi: 10.1016/j.cub.2018.03.035pubmed: 29706519google scholar: lookup
  23. Smith AV, Proops L, Grounds K, Wathan J, Scott SK, McComb K. Domestic horses (Equus caballus) discriminate between negative and positive human nonverbal vocalisations.. Sci Rep 2018 Aug 29;8(1):13052.
    doi: 10.1038/s41598-018-30777-zpmc: PMC6115467pubmed: 30158532google scholar: lookup
  24. Nakamura K, Takimoto-Inose A, Hasegawa T. Cross-modal perception of human emotion in domestic horses (Equus caballus).. Sci Rep 2018 Jun 21;8(1):8660.
    doi: 10.1038/s41598-018-26892-6pmc: PMC6013457pubmed: 29930289google scholar: lookup
  25. Ekman P, Friesen WV. Unmasking the Face: A Guide to Recognizing Emotions from Facial Clues. .
  26. Flom R, Gartman P. Does affective information influence domestic dogs' (Canis lupus familiaris) point-following behavior?. Anim Cogn 2016 Mar;19(2):317-27.
    doi: 10.1007/s10071-015-0934-5pubmed: 26515451google scholar: lookup
  27. Goossens BMA, Dekleva M, Reader SM, Sterck EHM, Bolhuis JJ. Gaze following in monkeys is modulated by observed facial expressions. Anim. Behav. 2008;75:1673–1681.
  28. Tomasello M, Call J, Hare B. Five primate species follow the visual gaze of conspecifics.. Anim Behav 1998 Apr;55(4):1063-9.
    doi: 10.1006/anbe.1997.0636pubmed: 9632490google scholar: lookup
  29. Shepherd SV. Following gaze: gaze-following behavior as a window into social cognition.. Front Integr Neurosci 2010;4:5.
    doi: 10.3389/fnint.2010.00005pmc: PMC2859805pubmed: 20428494google scholar: lookup
  30. Proops L, McComb K, Reby D. Cross-modal individual recognition in domestic horses (Equus caballus).. Proc Natl Acad Sci U S A 2009 Jan 20;106(3):947-51.
    doi: 10.1073/pnas.0809127105pmc: PMC2630083pubmed: 19075246google scholar: lookup
  31. Proops L, McComb K. Cross-modal individual recognition in domestic horses (Equus caballus) extends to familiar humans.. Proc Biol Sci 2012 Aug 22;279(1741):3131-8.
    doi: 10.1098/rspb.2012.0626pmc: PMC3385734pubmed: 22593108google scholar: lookup
  32. Met A, Miklósi Á, Lakatos G. Gaze-following behind barriers in domestic dogs.. Anim Cogn 2014 Nov;17(6):1401-5.
    doi: 10.1007/s10071-014-0754-zpubmed: 24816625google scholar: lookup
  33. Lampe JF, Andre J. Cross-modal recognition of human individuals in domestic horses (Equus caballus).. Anim Cogn 2012 Jul;15(4):623-30.
    doi: 10.1007/s10071-012-0490-1pubmed: 22526687google scholar: lookup

Citations

This article has been cited 10 times.