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  The effect of model uncertainty on cooperation in sensorimotor interactions

Grau-Moya, J., Hez, E., Pezzulo, G., & Braun, D. (2013). The effect of model uncertainty on cooperation in sensorimotor interactions. Journal of the Royal Society Interface, 10(87), 1-11. doi:10.1098/rsif.2013.0554.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-14AE-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-3DC9-9
Genre: Journal Article

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Grau-Moya, J1, 2, Author              
Hez, E1, 2, Author              
Pezzulo, G, Author
Braun, DA1, 2, Author              
Affiliations:
1Research Group Sensorimotor Learning and Decision-Making, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497809              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Decision-makers have been shown to rely on probabilistic models for perception and action. However, these models can be incorrect or partially wrong in which case the decision-maker has to cope with model uncertainty. Model uncertainty has recently also been shown to be an important determinant of sensorimotor behaviour in humans that can lead to risk-sensitive deviations from Bayes optimal behaviour towards worst-case or best-case outcomes. Here, we investigate the effect of model uncertainty on cooperation in sensorimotor interactions similar to the stag-hunt game, where players develop models about the other player and decide between a pay-off-dominant cooperative solution and a risk-dominant, non-cooperative solution. In simulations, we show that players who allow for optimistic deviations from their opponent model are much more likely to converge to cooperative outcomes. We also implemented this agent model in a virtual reality environment, and let human subjects play against a virtual player. In this game, subjects' pay-offs were experienced as forces opposing their movements. During the experiment, we manipulated the risk sensitivity of the computer player and observed human responses. We found not only that humans adaptively changed their level of cooperation depending on the risk sensitivity of the computer player but also that their initial play exhibited characteristic risk-sensitive biases. Our results suggest that model uncertainty is an important determinant of cooperation in two-player sensorimotor interactions.

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 Dates: 2013-10
 Publication Status: Published in print
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 Identifiers: DOI: 10.1098/rsif.2013.0554
BibTex Citekey: GrauMoyaHPB2013
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Title: Journal of the Royal Society Interface
Source Genre: Journal
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Pages: - Volume / Issue: 10 (87) Sequence Number: - Start / End Page: 1 - 11 Identifier: -