Evidence map›Paper›PMID 26843555›Full record

ArticleBiology letters2016

Does absolute brain size really predict self-control? Hand-tracking training improves performance on the A-not-B task.

S A Jelbert, A H Taylor, R D Gray

Abstract read
In one paragraph

Article in Biology letters, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.

0numbers the graph read from it
0cells of the map it votes in
26citing 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

26 citing papers in PubMed.

  1. Article
  2. Inhibitory control tests in non-human animals: validity, reliability, and perspectives.Biological reviews of the Cambridge Philosophical Society · 2025
    Review
  3. Embodied cognitive evolution and the limits of convergence.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Review
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  5. Review
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  8. Review
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  18. Article
  19. Comparative psychometrics: establishing what differs is central to understanding what evolves.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2018
    Review
  20. 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

3 authors.

S A JelbertSchool of Psychology, University of Auckland, Auckland, New Zealand s.jelbert@auckland.ac.nz.ORCID http://orcid.org/0000-0002-7503-0648
A H TaylorSchool of Psychology, University of Auckland, Auckland, New Zealand.ORCID http://orcid.org/0000-0003-3492-7667
R D GraySchool of Psychology, University of Auckland, Auckland, New Zealand Max Planck Institute for the Science of Human History, Jena, Germany Research School of the Social Sciences, Australian National University, Canberra, Australia.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Large-scale, comparative cognition studies are set to revolutionize the way we investigate and understand the evolution of intelligence. However, the conclusions reached by such work have a key limitation: the cognitive tests themselves. If factors other than cognition can systematically affect the performance of a subset of animals on these tests, we risk drawing the wrong conclusions about how intelligence evolves. Here, we examined whether this is the case for the A-not-B task, recently used by MacLean and co-workers to study self-control among 36 different species. Non-primates performed poorly on this task; possibly because they have difficulty tracking the movements of a human demonstrator, and not because they lack self-control. To test this, we assessed the performance of New Caledonian crows on the A-not-B task before and after two types of training. New Caledonian crows trained to track rewards moved by a human demonstrator were more likely to pass the A-not-B test than birds trained on an unrelated choice task involving inhibitory control. Our findings demonstrate that overlooked task demands can affect performance on a cognitive task, and so bring into question MacLean's conclusion that absolute brain size best predicts self-control.

Indexed as

Exploratory BehaviorSelf-ControlAnimalsBrainChoice BehaviorCrowsFemaleMaleRewardcomparative cognitioncorvidsevolution of intelligenceNew Caledonian crowsprimatesself-control

Identifiers

PMID26843555
PMCPMC4780546

What OpenQuestion holds

Textmetadata
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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.