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Risk sensitivity as an evolutionary adaptation.

Arend Hintze1, Randal S Olson2, Christoph Adami1

  • 11] Department of Microbiology and Molecular Genetics [2] BEACON Center for the Study of Evolution in Action Michigan State University, East Lansing, MI, USA.

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Summary
This summary is machine-generated.

Risk aversion evolved in small populations, suggesting an evolutionary adaptation to group living. This behavior emerged when high-impact, rare events, like mating, influenced survival in ancestral human groups.

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Area of Science:

  • Evolutionary biology
  • Behavioral economics
  • Neuroscience

Background:

  • Risk aversion is a fundamental behavior observed in humans and animals.
  • Traditional economic models define risk preferences via utility function curvature.
  • Psychological and neurophysiological studies explore loss aversion and probability weighting in risk aversion.

Purpose of the Study:

  • To investigate the evolutionary origins of risk aversion.
  • To determine if risk aversion is an adaptive strategy for survival in ancestral environments.
  • To explore the relationship between population size and the evolution of risk-averse strategies.

Main Methods:

  • Evolving game strategies to play an equivalent mean payoff gamble.
  • Simulating population dynamics with varying group sizes and event frequencies.
  • Analyzing the conditions under which risk-averse strategies confer a fitness advantage.

Main Results:

  • Risk aversion evolved only in small populations (<1,000 individuals) or those segmented into small groups (≤150 individuals).
  • Risk aversion was favored when gambles represented rare events with significant fitness consequences.
  • The evolution of risk aversion was contingent on the impact of the gamble on individual survival and reproduction.

Conclusions:

  • Risk aversion may have evolved as an adaptation to the social structure of small ancestral human groups.
  • Rare, high-stakes events, such as those related to mating and mate competition, could be evolutionary drivers of risk aversion.
  • The findings support an evolutionary explanation for risk-averse behavior rooted in ancestral living conditions.