Rationality and cognitive bias in captive gorillas' and orang-utans' economic decision-making

Human economic decision-making sometimes appears to be irrational. Partly, this is due to cognitive biases that can lead to suboptimal economic choices and context-dependent risk-preferences. A pertinent question is whether such biases are part of our evolutionary heritage or whether they are cultur...

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Bibliographic Details
Published in:	PloS one Vol. 17; no. 12; p. e0278150
Main Authors:	Lacombe, Penelope, Brocard, Sarah, Zuberbühler, Klaus, Dahl, Christoph D
Format:	Journal Article
Language:	English
Published:	United States Public Library of Science 14-12-2022 Public Library of Science (PLoS)
Subjects:	Analysis Animals Behavior Bias Biology and Life Sciences Cognition Cognitive ability Context Decision making Evaluation Gorilla gorilla Gorilla gorilla gorilla Gorillas Hominidae Human bias Humans Monkeys & apes Orangutan Pongo abelii Pongo pygmaeus Primates Reinforcement Research and Analysis Methods Risk assessment Set (Psychology) Social Sciences United States
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Summary:	Human economic decision-making sometimes appears to be irrational. Partly, this is due to cognitive biases that can lead to suboptimal economic choices and context-dependent risk-preferences. A pertinent question is whether such biases are part of our evolutionary heritage or whether they are culturally acquired. To address this, we tested gorillas (Gorilla gorilla gorilla) and orang-utans (Pongo abelii) with two risk-assessment experiments that differed in how risk was presented. For both experiments, we found that subjects increased their preferences for the risky options as their expected gains increased, showing basic understanding of reward contingencies and rational decision-making. However, we also found consistent differences in risk proneness between the two experiments, as subjects were risk-neutral in one experiment and risk-prone in the other. We concluded that gorillas and orang-utans are economically rational but that their decisions can interact with pre-existing cognitive biases which modulates their risk-preference in context-dependent ways, explaining the variability of their risk-preference in previous literature.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Competing Interests: The authors have declared that no competing interests exist. KZ and CDD are joint last authors.
ISSN:	1932-6203 1932-6203
DOI:	10.1371/journal.pone.0278150