Evidence map›Paper›PMID 28680660›Full record

ArticleRoyal Society open science2017

Memory for stimulus sequences: a divide between humans and other animals?

Stefano Ghirlanda, Johan Lind, Magnus Enquist

Open access · goldAbstract read
In one paragraph

Article in Royal Society open science, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed, 1 pooled it
5.8field-weighted citation impact, top 4% of its field
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

19 citing papers in PubMed, 1 synthesis or guideline pooled it, 51 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. One Biology and the Status of Humans.Animals : an open access journal from MDPI · 2025
    Review
  4. Article
  5. Results from ReindlRoyal Society open science · 2025
    Article
  6. Article
  7. Evolution of diverse (and advanced) cognitive abilities through adaptive fine-tuning of learning and chunking mechanisms.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Article
  8. Sequences and animal intelligence.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Review
  9. Article
  10. Article
  11. Article
  12. Article
  13. Experts in action: why we need an embodied social brain hypothesis.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2022
    Article
  14. Article
  15. 'Dunbar's number' deconstructed.Biology letters · 2021
    Article
  16. A Connectomic Hypothesis for the Hominization of the Brain.Cerebral cortex (New York, N.Y. : 1991) · 2021
    Article
  17. Article
  18. Neuronal Encoding in a High-Level Auditory Area: From Sequential Order of Elements to Grammatical Structure.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2019
    Article
  19. 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 at 2 institutions in 2 countries.

Stefano GhirlandaDepartment of Psychology, Brooklyn College, Brooklyn, NY, USA.ORCID 0000-0002-7270-9612
Johan LindCentre for the Study of Cultural Evolution, Stockholm University, Stockholm, Sweden.
Magnus EnquistCentre for the Study of Cultural Evolution, Stockholm University, Stockholm, Sweden.
Stockholm University · SEThe Graduate Center, CUNY · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Humans stand out among animals for their unique capacities in domains such as language, culture and imitation, yet it has been difficult to identify cognitive elements that are specifically human. Most research has focused on how information is processed after it is acquired, e.g. in problem solving or 'insight' tasks, but we may also look for species differences in the initial acquisition and coding of information. Here, we show that non-human species have only a limited capacity to discriminate ordered sequences of stimuli. Collating data from 108 experiments on stimulus sequence discrimination (1540 data points from 14 bird and mammal species), we demonstrate pervasive and systematic errors, such as confusing a red-green sequence of lights with green-red and green-green sequences. These errors can persist after thousands of learning trials in tasks that humans learn to near perfection within tens of trials. To elucidate the causes of such poor performance, we formulate and test a mathematical model of non-human sequence discrimination, assuming that animals represent sequences as unstructured collections of memory traces. This representation carries only approximate information about stimulus duration, recency, order and frequency, yet our model predicts non-human performance with a 5.9% mean absolute error across 68 datasets. Because human-level cognition requires more accurate encoding of sequential information than afforded by memory traces, we conclude that improved coding of sequential information is a key cognitive element that may set humans apart from other animals.

Indexed as

animal cognitionhuman uniquenessstimulus sequencesworking memory

Identifiers

PMID28680660
PMCPMC5493902
OpenAlexW2684587727

What OpenQuestion holds

Textmetadata
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.