Evidence map›Paper›PMID 28673920›Full record

ReviewPhilosophical transactions of the Royal Society of London. Series B, Biological sciences2017

Why are there so many explanations for primate brain evolution?

R I M Dunbar, Susanne Shultz

Abstract readReview
In one paragraph

Review in Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 71 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
71citing 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

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

  1. Socioecological complexity in primate groups and its cognitive correlates.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2022
    Pooled it
  2. Article
  3. Article
  4. Article
  5. Article
  6. Sex and Gender Identities Are Emergent Properties of Neural Complexity.Behavioral sciences (Basel, Switzerland) · 2025
    Review
  7. Article
  8. Review
  9. Why friendship and loneliness affect our health.Annals of the New York Academy of Sciences · 2025
    Review
  10. Article
  11. Article
  12. Article
  13. Oxygen and the Spark of Human Brain Evolution: Complex Interactions of Metabolism and Cortical Expansion across Development and Evolution.The Neuroscientist : a review journal bringing neurobiology, neurology and psychiatry · 2024
    Article
  14. Article
  15. Article
  16. Article
  17. Human cooperation and evolutionary transitions in individuality.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2023
    Article
  18. Article
  19. Article
  20. Article

11 more citing papers are in PubMed but not listed here.

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

2 authors.

R I M DunbarDepartment of Experimental Psychology, University of Oxford, South Parks Road, Oxford OX1 3UD, UK robin.dunbar@psy.ox.ac.uk.ORCID http://orcid.org/0000-0002-9982-9702
Susanne ShultzSchool of Biological Sciences, University of Manchester, Manchester M13 9PL, UK.ORCID http://orcid.org/0000-0002-7135-4880

Funding

European Research Council 295663
6 · The paper itself

Abstract

The question as to why primates have evolved unusually large brains has received much attention, with many alternative proposals all supported by evidence. We review the main hypotheses, the assumptions they make and the evidence for and against them. Taking as our starting point the fact that every hypothesis has sound empirical evidence to support it, we argue that the hypotheses are best interpreted in terms of a framework of evolutionary causes (selection factors), consequences (evolutionary windows of opportunity) and constraints (usually physiological limitations requiring resolution if large brains are to evolve). Explanations for brain evolution in birds and mammals generally, and primates in particular, have to be seen against the backdrop of the challenges involved with the evolution of coordinated, cohesive, bonded social groups that require novel social behaviours for their resolution, together with the specialized cognition and neural substrates that underpin this. A crucial, but frequently overlooked, issue is that fact that the evolution of large brains required energetic, physiological and time budget constraints to be overcome. In some cases, this was reflected in the evolution of 'smart foraging' and technical intelligence, but in many cases required the evolution of behavioural competences (such as coalition formation) that required novel cognitive skills. These may all have been supported by a domain-general form of cognition that can be used in many different contexts.This article is part of the themed issue 'Physiological determinants of social behaviour in animals'.

Indexed as

Biological EvolutionCognitionSocial BehaviorAnimalsBrainPrimatescoalitionsenergeticsforaging innovationsmultilevel socialitysocial brain hypothesissocial complexity

Identifiers

PMID28673920
PMCPMC5498304

What OpenQuestion holds

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Registered trials

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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.