Evidence map›Paper›PMID 32457923›Full record

ArticleFrontiers in veterinary science2020

Contagious Yawning in African Elephants

Zoë T Rossman, Clare Padfield, Debbie Young, Benjamin L Hart, Lynette A Hart

Abstract read
In one paragraph

Article in Frontiers in veterinary science, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.

0numbers the graph read from it
0cells of the map it votes in
8citing papers in PubMed
–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

8 citing papers in PubMed.

  1. Article
  2. Article
  3. Article
  4. Article
  5. How video calls affect mimicry and trust during interactions.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2023
    Article
  6. Interspecific Contagious Yawning in Humans.Animals : an open access journal from MDPI · 2022
    Article
  7. No Evidence for Contagious Yawning in Juvenile Ravens (Animals : an open access journal from MDPI · 2022
    Article
  8. One thousand yawns.Primates; journal of primatology · 2020
    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

5 authors.

Zoë T RossmanDepartment of Evolution and Ecology, University of California, Davis, Davis, CA, United States.
Clare PadfieldAfrican Elephant Research Unit Knysna Elephant Park, Western Cape, South Africa.
Debbie YoungAfrican Elephant Research Unit Knysna Elephant Park, Western Cape, South Africa.
Benjamin L HartDepartment of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States.
Lynette A HartDepartment of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

While spontaneous yawning is common across all vertebrate classes, contagious yawning is less common and has been observed only in a few species of social animals. Interspecific contagious yawning in response to yawning by humans has been observed only by chimpanzees and dogs. After confirming additional occurrences of intraspecific contagious yawning in a group of captive African elephants previously studied, we further investigated the potential for the same group of elephants to engage in interspecific contagious yawning with familiar human handlers. Ten captive African elephants, most of whom had been previously studied, were observed over 13 nights for evidence of intraspecific contagious yawning. Seven of these elephants were also involved in trials where familiar handlers performed staged yawns, as well as trials with staged non-yawning gapes, or trials with no yawns or gapes. Incorporating previously collected contagious yawning data, we describe nine instances of intraspecific contagious yawning in the elephants. Three of the seven elephants yawned contagiously in response to humans during the interspecific yawning trials. This is the first report of interspecific contagious yawning by elephants in response to yawns by familiar humans.

Indexed as

African elephantscontagious yawninginterspecificintraspecificLoxodonta africanayawning

Identifiers

PMID32457923
PMCPMC7225334

What OpenQuestion holds

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LicenceCC BY
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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.