Evidence map›Paper›PMID 33041946›Full record

ArticleFrontiers in psychology2020

Human Face Recognition in Horses: Data in Favor of a Holistic Process.

Léa Lansade, Violaine Colson, Céline Parias, Fabrice Reigner, Aline Bertin, Ludovic Calandreau

Abstract read
In one paragraph

Article in Frontiers in psychology, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
10citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

10 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Article
  3. Article
  4. Touchscreen Tasks for Cognitive Testing in Domestic Goats (Animals : an open access journal from MDPI · 2025
    Article
  5. Nay to Prey: Challenging the View of Horses as a "Prey" Species.Animals : an open access journal from MDPI · 2025
    Review
  6. Article
  7. Article
  8. Article
  9. Article
  10. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Léa LansadePRC, INRAE, CNRS, IFCE, University Tours, Nouzilly, France.
Violaine ColsonLPGP, INRAE, UR1037 Fish Physiology and Genomics, Rennes, France.
Céline PariasPRC, INRAE, CNRS, IFCE, University Tours, Nouzilly, France.
Fabrice ReignerUnité Expérimentale de Physiologie Animale de l'Orfrasière, Nouzilly, France.
Aline BertinPRC, INRAE, CNRS, IFCE, University Tours, Nouzilly, France.
Ludovic CalandreauPRC, INRAE, CNRS, IFCE, University Tours, Nouzilly, France.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Recent studies have demonstrated that horses can recognize humans based simply on visual information. However, none of these studies have investigated whether this involves the recognition of the face itself, or simply identifying people from non-complex external clues, such as hair color. To go beyond this we wanted to know whether certain features of the face were indispensable for this recognition (e.g., colors, hair or eyes). The 11 horses in this study had previously learned to identify four unfamiliar faces (portrait view and in color) presented repeatedly on a screen. We thus assessed whether they were able to identify these same faces spontaneously when they were presented in four other conditions: profile view, black and white, eyes hidden, changed hairstyle. The horses' performances remained higher than chance level for all the conditions. In a choice test under real conditions, they then approached the people whose face they had learned more often than unknown people. In conclusion, when considering all the individuals studied, no single facial element that we tested appears to be essential for recognition, suggesting holistic processing in face recognition. That means horses do not base their recognition solely on an easy clue such as hair color. They can also link faces from photographs with people in real life, indicating that horses do not process images of faces as simple abstract shapes.

Indexed as

animal cognitionEquus caballusface recognitionhorse modelhuman–animal relationship

Identifiers

PMID33041946
PMCPMC7522352

What OpenQuestion holds

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LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.