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Non-human primates use combined rules when deciding under ambiguity

Research output: Contribution to journalArticlepeer-review

Author(s)

A. Romain, M.-H. Broihanne, A. De Marco, B. Ngoubangoye, Josep Call, N. Rebout, V. Dufour

School/Research organisations

Abstract

Decision outcomes in unpredictable environments may not have exact known probabilities. Yet the predictability level of outcomes matters in decisions, and animals, including humans, generally avoid ambiguous options. Managing ambiguity may be more challenging and requires stronger cognitive skills than decision-making under risk, where decisions involve known probabilities. Here we compare decision-making in capuchins, macaques, orangutans, gorillas, chimpanzees and bonobos in risky and ambiguous contexts. Subjects were shown lotteries (a tray of potential rewards, some large, some small) and could gamble a medium-sized food item to obtain one of the displayed rewards. The odds of winning and losing varied and were accessible in the risky context (all rewards were visible) or partially available in the ambiguous context (some rewards were covered). In the latter case, the level of information varied from fully ambiguous (individuals could not guess what was under the covers) to predictable (individuals could guess). None of the species avoided gambling in ambiguous lotteries and gambling rates were high if at least 2 large rewards were visible. Capuchins and bonobos ignored the covered items and gorillas and macaques took the presence of potential rewards into account, but only chimpanzees and orangutans could consistently build correct expectations about the size of the covered rewards. Chimpanzees and orangutans combined decision rules according to the number of large visible rewards and the level of predictability, a process resembling conditional probabilities assessment in humans. Despite a low sample size, this is the first evidence in non-human primates that a combination of several rules can underlie choices made in an unpredictable environment. Our finding that non-human primates can deal with the uncertainty of an outcome when exchanging one food item for another is a key element to the understanding of the evolutionary origins of economic behavior.
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Details

Original languageEnglish
JournalPhilosophical Transactions of the Royal Society. B, Biological Sciences
Volume376
Issue number1819
Early online date11 Jan 2021
DOIs
Publication statusPublished - 1 Mar 2021

    Research areas

  • Gambling risk, Conditional probability, Decision-making, Monkeys, Apes

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