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Irrational choice behavior in human and nonhuman primates.

Bonnie M Perdue1, Ella R Brown2,3

  • 1Agnes Scott College, 141 E. College Ave., Decatur, GA, 30030, USA. bonnie.m.perdue@gmail.com.

Animal Cognition
|January 3, 2018
PubMed
Summary
This summary is machine-generated.

Humans and primates demonstrate a preference for choice, even when it deviates from economic rationality. This study found that both humans and capuchin monkeys adjust their choices to maintain available options, suggesting a shared mechanism for the desire for choice.

Keywords:
Capuchin monkeysChoiceIrrationalityRhesus macaquesRisk

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Area of Science:

  • Cognitive Science
  • Comparative Psychology
  • Neuroeconomics

Background:

  • Humans generally prefer having choice, but this preference can lead to suboptimal decisions.
  • Deviations from economic rationality, such as valuing diminishing options, are observed in human choice behavior.
  • Understanding the evolutionary and mechanistic basis of choice preference is crucial.

Purpose of the Study:

  • To investigate choice behavior and preference for options in nonhuman primates compared to humans.
  • To examine whether the tendency to preserve available choices, even at a cost, is conserved across primate species.
  • To explore the underlying mechanisms of choice preservation in decision-making.

Main Methods:

  • A computerized task was used, presenting capuchin monkeys, rhesus macaques, and humans with two icons offering different risk-reward trade-offs.
  • Choice preference scores were established when options were continuously available.
  • Preference patterns were assessed when options diminished, requiring selection to remain available.

Main Results:

  • Humans shifted risk preferences in the diminishing options phase, selecting icons more equally to keep both available.
  • Capuchin monkeys, as a group, exhibited similar choice preservation behavior.
  • Significant individual variability in choice preservation was observed in both capuchin monkeys and rhesus macaques.

Conclusions:

  • The study suggests a continuity in the desire for choice between humans and nonhuman primates.
  • The motivation to maintain available options appears to be a shared trait across primate species.
  • Individual differences play a significant role in how primates and humans manage choice availability.