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Social selectivity in aging wild chimpanzees.

Alexandra G Rosati1, Lindsey Hagberg2, Drew K Enigk3

  • 1Departments of Psychology and Anthropology, University of Michigan, Ann Arbor, MI, USA. rosati@umich.edu zarin.machanda@tufts.edu.

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Summary
This summary is machine-generated.

Aging male chimpanzees develop more mutual friendships and shift towards positive social interactions. This suggests social selectivity can evolve without complex future-thinking, offering evolutionary insights into human social aging patterns.

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Area of Science:

  • Primatology
  • Evolutionary Anthropology
  • Behavioral Ecology

Background:

  • Socioemotional selectivity theory posits that humans prioritize close relationships in aging due to future time orientation.
  • Understanding the evolutionary roots of social aging requires examining non-human primates.

Purpose of the Study:

  • To test key elements of human social aging theory in wild chimpanzees.
  • To investigate if social selectivity emerges without complex future-oriented cognition.

Main Methods:

  • Longitudinal data analysis of wild chimpanzee social behavior.
  • Examining changes in friendship quality, social interaction types, and solitude with age.

Main Results:

  • Aging male chimpanzees exhibit more mutual, equitable friendships compared to younger males.
  • Older males spend more time alone but also increase socialization with key partners.
  • A life-span shift from agonistic to affiliative interactions is observed in males.

Conclusions:

  • Social selectivity in aging can arise independently of complex future-time cognition.
  • Chimpanzee social aging patterns provide an evolutionary context for human social behavior.
  • Findings challenge the necessity of future-oriented cognition for developing age-related social preferences.