Evidence map›Paper›PMID 31871167›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2020

Teaching varies with task complexity in wild chimpanzees.

Stephanie Musgrave, Elizabeth Lonsdorf, David Morgan, Madison Prestipino, Laura Bernstein-Kurtycz, Roger Mundry, Crickette Sanz

Abstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers.

0numbers the graph read from it
0cells of the map it votes in
27citing 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

27 citing papers in PubMed.

  1. Article
  2. Article
  3. Article
  4. Brokering peace in the ape (culture) wars.Evolutionary human sciences · 2026
    Article
  5. The growing methodological toolkit for identifying and studying social learning and culture in non-human animals.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Review
  6. Article
  7. Article
  8. Article
  9. Article
  10. Review
  11. Article
  12. Article
  13. Review
  14. The cultural evolution of teaching.Evolutionary human sciences · 2023
    Review
  15. Article
  16. Article
  17. Article
  18. The origins of human cumulative culture: from the foraging niche to collective intelligence.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2022
    Article
  19. Collective knowledge and the dynamics of culture in chimpanzees.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2022
    Article
  20. Article
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

7 authors.

Stephanie MusgraveDepartment of Anthropology, University of Miami, Coral Gables, FL 33124; smusgrave@miami.edu.
Elizabeth LonsdorfDepartment of Psychology, Franklin and Marshall College, Lancaster, PA 17604.
David MorganLester E. Fisher Center for the Study and Conservation of Apes, Lincoln Park Zoo, Chicago, IL 60614.
Madison PrestipinoBiological Foundations of Behavior Program, Franklin and Marshall College, Lancaster, PA 17604.
Laura Bernstein-KurtyczDepartment of Biology, Case Western Reserve University, Cleveland, OH 44106.
Roger MundryMax Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany.
Crickette SanzDepartment of Anthropology, Washington University in St. Louis, St. Louis, MO 63130.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Cumulative culture is a transformative force in human evolution, but the social underpinnings of this capacity are debated. Identifying social influences on how chimpanzees acquire tool tasks of differing complexity may help illuminate the evolutionary origins of technology in our own lineage. Humans routinely transfer tools to novices to scaffold their skill development. While tool transfers occur in wild chimpanzees and fulfill criteria for teaching, it is unknown whether this form of helping varies between populations and across tasks. Applying standardized methods, we compared tool transfers during termite gathering by chimpanzees in the Goualougo Triangle, Republic of Congo, and in Gombe, Tanzania. At Goualougo, chimpanzees use multiple, different tool types sequentially, choose specific raw materials, and perform modifications that improve tool efficiency, which could make it challenging for novices to manufacture suitable tools. Termite gathering at Gombe involves a single tool type, fishing probes, which can be manufactured from various materials. Multiple measures indicated population differences in tool-transfer behavior. The rate of transfers and probability of transfer upon request were significantly higher at Goualougo, while resistance to transfers was significantly higher at Gombe. Active transfers of tools in which possessors moved to facilitate possession change upon request occurred only at Goualougo, where they were the most common transfer type. At Gombe, tool requests were typically refused. We suggest that these population differences in tool-transfer behavior may relate to task complexity and that active helping plays an enhanced role in the cultural transmission of complex technology in wild apes.

Indexed as

Behavior, AnimalTool Use BehaviorAnimalsCongoFeeding BehaviorFemaleIsopteraMaleMothersNesting BehaviorPan troglodytesSocial LearningTanzaniachimpanzeecumulative cultureprosocialitysocial learningtool use

Identifiers

PMID31871167
PMCPMC6969499

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
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.