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Teaching varies with task complexity in wild chimpanzees.

Stephanie Musgrave1, Elizabeth Lonsdorf2,3, David Morgan4

  • 1Department of Anthropology, University of Miami, Coral Gables, FL 33124; smusgrave@miami.edu.

Proceedings of the National Academy of Sciences of the United States of America
|December 25, 2019
PubMed
Summary
This summary is machine-generated.

Wild chimpanzees exhibit varying tool-transfer behaviors based on task complexity. Goualougo chimpanzees actively transfer tools more frequently, especially for complex tasks, unlike Gombe chimpanzees.

Keywords:
chimpanzeecumulative cultureprosocialitysocial learningtool use

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Area of Science:

  • Primate behavior
  • Evolutionary anthropology
  • Cognitive ethology

Background:

  • Cumulative culture is key to human evolution, but its social origins are debated.
  • Understanding chimpanzee tool acquisition can illuminate human technological evolution.
  • Tool transfers, a form of teaching, occur in wild chimpanzees but their population-specific variations are unknown.

Purpose of the Study:

  • To compare tool transfer behaviors in chimpanzees across different populations and task complexities.
  • To investigate the role of social learning in the development of tool use in apes.
  • To explore the evolutionary roots of human technological innovation.

Main Methods:

  • Standardized observational methods were used to compare tool transfers during termite gathering in Goualougo and Gombe chimpanzee populations.
  • Quantitative measures of transfer rates, request acceptance, and active assistance were analyzed.
  • Task complexity was assessed based on tool types, material selection, and modification.

Main Results:

  • Significant population differences in tool transfer rates and resistance were observed.
  • Goualougo chimpanzees showed higher transfer rates and active assistance, particularly for complex tool use.
  • Gombe chimpanzees exhibited higher resistance to transfers and primarily used simpler, single-tool techniques.

Conclusions:

  • Population-specific differences in tool transfer behavior are linked to the complexity of the tool-use task.
  • Active helping plays a crucial role in the cultural transmission of complex technologies in wild apes.
  • These findings offer insights into the evolution of social learning and technology in the human lineage.