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Home / Equine Research Bank / Sci Rep / Female horses spontaneously identify a photograph of their k...
Scientific reports2020; 10(1); 6302; doi: 10.1038/s41598-020-62940-w

Female horses spontaneously identify a photograph of their keeper, last seen six months previously.

Abstract: Horses are capable of identifying individual conspecifics based on olfactory, auditory or visual cues. However, this raises the questions of their ability to recognize human beings and on the basis of what cues. This study investigated whether horses could differentiate between a familiar and unfamiliar human from photographs of faces. Eleven horses were trained on a discrimination task using a computer-controlled screen, on which two photographs were presented simultaneously (32 trials/session): touching one was rewarded (S+) and the other not (S-). In the training phase, the S+ faces were of four unfamiliar people which gradually became familiar over the trials. The S- faces were novel for each trial. After the training phase, the faces of the horses' keepers were presented opposite novel faces to test whether the horses could identify the former spontaneously. A reward was given whichever face was touched to avoid any possible learning effect. Horses touched the faces of keepers significantly more than chance, whether it was their current keeper or one they had not seen for six months (t = 3.65; p < 0.004 and t = 6.24; p < 0.0001). Overall, these results show that horses have advanced human face-recognition abilities and a long-term memory of those human faces.
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Publication Date: 2020-04-14 PubMed ID: 32286345PubMed Central: PMC7156667DOI: 10.1038/s41598-020-62940-wGoogle Scholar: Lookup
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  • Journal Article
  • Research Support
  • Non-U.S. Gov't

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 article highlights the observation that horses can recognise human faces from photographs, even those humans they have not seen for up to six months.

Experiment Design

  • The study set out to investigate if horses are able to differentiate between familiar and unfamiliar human faces using pictures. The test involved eleven horses that were trained to perform a discrimination task with the aid of a computer-controlled screen.
  • On the screen, two photographs were presented simultaneously in each session, amounting to 32 trials per session. If a horse touched one photograph (S+), it would get a reward, while touching the other photograph (S-) gave no reward.
  • In the training phase, the rewarded (S+) photographs featured faces of four unfamiliar people who, over time, became familiar to the horses due to their repeated presentation. Conversely, the non-rewarded (S-) photographs displayed different faces in each trial.

Testing Phase and Results

  • After the training, the researchers tested the horses’ recognition ability using the faces of their keepers. The horses’ keepers’ faces were presented alongside new faces in the testing phase to observe whether the horses could spontaneously identify the faces of individuals they were accustomed to.
  • To prevent possible learning effect, in this phase, the horses got a reward no matter which face they touched.
  • The results demonstrated that the horses touched the faces of their keepers significantly more often than can be attributed to chance. This happened irrespective of whether the face was of their current keeper or someone they had not seen for six months.
  • From these findings, the manuscript infers horses’ capacity for advanced human face recognition and establishes their ability to remember human faces for an extensive period.

Cite This Article

APA
Lansade L, Colson V, Parias C, Trösch M, Reigner F, Calandreau L. (2020). Female horses spontaneously identify a photograph of their keeper, last seen six months previously. Sci Rep, 10(1), 6302. https://doi.org/10.1038/s41598-020-62940-w

Publication

Scientific reports
ISSN: 2045-2322
NlmUniqueID: 101563288
Country: England
Language: English
Volume: 10
Issue: 1
Pages: 6302
PII: 6302

Researcher Affiliations

Lansade, Léa
  • PRC, INRAE, CNRS, IFCE, University Tours, F-37380, Nouzilly, France. lea.lansade@inrae.fr.
Colson, Violaine
  • INRAE, UR1037 Fish Physiology and Genomics, F-35000, Rennes, France.
Parias, Céline
  • PRC, INRAE, CNRS, IFCE, University Tours, F-37380, Nouzilly, France.
Trösch, Miléna
  • PRC, INRAE, CNRS, IFCE, University Tours, F-37380, Nouzilly, France.
Reigner, Fabrice
  • UEPAO, F-37380, Nouzilly, France.
Calandreau, Ludovic
  • PRC, INRAE, CNRS, IFCE, University Tours, F-37380, Nouzilly, France.

MeSH Terms

  • Animals
  • Behavior, Animal / physiology
  • Cues
  • Facial Recognition / physiology
  • Female
  • Horses / physiology
  • Humans
  • Memory / physiology
  • Photic Stimulation / methods
  • Photography

Conflict of Interest Statement

The authors declare no competing interests.

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