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Decision making under risk and ambiguity in human and non-human primates| old_uid | 20117 |
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| title | Decision making under risk and ambiguity in human and non-human primates |
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| start_date | 2022/03/04 |
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| schedule | 15h30-18h |
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| online | no |
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| summary | Decision making under risk is fundamental in humans and other animals. Biologists generally aim at highlighting particular attitudes towards risk (i.e. risk proneness or risk aversion for example) that would reflect naturally selected adaptations to past environmental conditions for a given species. However, in these studies, it is not always clear whether animal choices are made under risk or under ambiguity. In humans, responses in one context do not necessarily predict responses in another. For example, individuals who are risk averse are not necessarily ambiguity averse. The general belief is that animals show strong aversion to ambiguity. We investigated the response of 4 great apes and 2 monkey species in an ambiguous gambling game. Subjects had no exact knowledge of the odds associated to the outcome of their gambling. Dealing with unpredictability may be more challenging and require more cognitive flexibility. We expected some species to reject ambiguity and/or use even simple decision rules (heuristics). However, under this ambiguous context, individuals gambled as if they had built expectations about the missing information and more so in orangutans, gorillas and chimpanzees. Using decision trees, we could identify each step of the decisional process. Results show that non-human primates can combine several decision rules to make their decision in an unpredictable environment. |
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| oncancel | Nouveau - |
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| responsibles | Palminteri |
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