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Variance-sensitive choice in lemurs: constancy trumps quantity.

Evan L MacLean1, Tara M Mandalaywala, Elizabeth M Brannon

  • 1Department of Evolutionary Anthropology, Duke University, Biological Sciences Building, Durham, NC, 27708, USA. maclean@duke.edu

Animal Cognition
|June 15, 2011
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Summary
This summary is machine-generated.

Lemurs, primates from Madagascar, generally avoid risky foraging choices, even when potential rewards are higher. Their risk aversion reflects adaptations to unpredictable island environments, prioritizing survival by minimizing energetic demands.

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Area of Science:

  • Behavioral Ecology
  • Primate Cognition
  • Evolutionary Psychology

Background:

  • Animal foraging behavior is influenced by metabolic state, with negative energy budgets increasing risk tolerance and positive budgets promoting risk aversion.
  • Malleable risk preferences can be evolutionarily advantageous for survival during energetic stress.
  • Animals in unpredictable environments are expected to reduce energetic demands and maintain risk aversion.

Purpose of the Study:

  • To measure risk preferences in lemurs, a primate group endemic to Madagascar.
  • To investigate if lemurs exhibit risk aversion, consistent with their evolutionary adaptations to a harsh environment.
  • To explore how changes in reward structure affect lemur risk-taking behavior.

Main Methods:

  • A behavioral task was designed to present lemurs with a choice between a certain reward and a variable, potentially larger reward.
  • Experiment 1 involved equal average rewards for both options to assess baseline risk aversion.
  • Experiment 2 systematically increased the average value of the variable option relative to the constant option.

Main Results:

  • Lemurs demonstrated significant risk aversion when the average rewards of constant and variable options were equal.
  • Lemur risk-seeking behavior increased as the risk premium (average difference in payout) of the variable option rose.
  • A substantial proportion of lemurs remained highly risk-averse even when the variable option offered double the average payout of the constant option.

Conclusions:

  • Lemur risk preferences align with their evolutionary history of adapting to unpredictable island conditions.
  • The findings support the hypothesis that lemur cognition is shaped to minimize risk and conserve energy.
  • Behavioral risk aversion in lemurs is a key trait for survival in their challenging native habitat.