Rationality and cognitive bias in captive gorillas’ and orang-utans’ economic decision-making
Date
14/12/2022Metadata
Show full item recordAbstract
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.
Citation
Lacombe , P , Brocard , S , Zuberbühler , K & Dahl , C D 2022 , ' Rationality and cognitive bias in captive gorillas’ and orang-utans’ economic decision-making ' , PLoS ONE , vol. 17 , no. 12 , e0278150 . https://doi.org/10.1371/journal.pone.0278150
Publication
PLoS ONE
Status
Peer reviewed
ISSN
1932-6203Type
Journal article
Description
Funding: This work was supported with funding by the Swiss National Science Foundation (grant PZ00P3_154741 (CDD), 310030_185324 (KZ), and NCCR Evolving Language (Agreement #51NF40_180888 (KZ)), and the Taipei Medical University (Startup-funding, grant 108-6402-004-112 (CDD)).Collections
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