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Sociality influences cultural complexity.

Michael Muthukrishna1, Ben W Shulman, Vlad Vasilescu

  • 1Department of Psychology, University of British Columbia, , Vancouver, British Columbia, Canada , V6T 1Z4, Psychology Department, University of California, , Los Angeles, CA 90095, USA, Department of Economics, University of British Columbia, , Vancouver, British Columbia, Canada , V6T 1Z4, Canadian Institute for Advanced Research, , Toronto, Ontario, Canada.

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Summary
This summary is machine-generated.

Larger, interconnected groups develop more complex skills and technologies. Losing social connections leads to skill degradation, highlighting the importance of social learning for cumulative culture.

Keywords:
copyingcultural evolutioncultureevolutionsocial learning

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Area of Science:

  • Evolutionary Anthropology
  • Cognitive Science
  • Social Learning Theory

Background:

  • Population size and social structure correlate with technological diversity.
  • Evolutionary models propose social interconnectedness drives cultural complexity.
  • Models predict skill loss following reduced sociality or population size.

Purpose of the Study:

  • To experimentally test the link between social learning opportunities and cultural evolution.
  • To investigate how population size and interconnectedness influence skill acquisition and retention.

Main Methods:

  • Two laboratory experiments were conducted using human participants as learners.
  • Experiment 1: Naive participants learned an image-editing task with either one or five models.
  • Experiment 2: Participants learned a knot-tying task, starting with experts, with one or five models.

Main Results:

  • Participants with access to five models improved skills over generations; those with one model did not.
  • Skill loss was more rapid in groups with only one model compared to five.
  • Final generation participants with five models consistently outperformed those with one model.

Conclusions:

  • Greater social learning opportunities (more models) enhance cumulative cultural evolution.
  • Social interconnectedness is crucial for maintaining and advancing complex skills.
  • Findings support theoretical predictions on the role of sociality in cultural complexity.