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Arguments, More than Confidence, Explain the Good Performance of Reasoning Groups

Journal of Experimental Psychology: General (Forthcoming)

50 Pages Posted: 2 May 2014 Last revised: 8 May 2014

Emmanuel Trouche

University of Lyon 1 - Laboratoire Sur Le Langage, Le Cerveau Et La Cognition (L2C2)

Emmanuel Sander

University of Paris 8 Vincennes-Saint Denis

Hugo Mercier

University of Neuchatel

Date Written: May 1, 2014

Abstract

In many intellective tasks groups consistently outperform individuals. One factor is that the individual(s) with the best answer is able to convince the other group members using sound argumentation. Another factor is that the most confident group member imposes her answer whether it is right or wrong. In Experiments 1 and 2, individual participants were given arguments against their answer in intellective tasks. Demonstrating sound argumentative competence, many participants changed their mind to adopt the correct answer even though the arguments had no confidence markers, and barely any participant changed their mind to adopt an incorrect answer. Confidence could not explain who changed their mind, as the least confident participants were as likely to change their mind as the most confident. In Experiments 3 (adults) and 4 (10-year-olds), participants solved intellective tasks individually and then in groups, before solving transfer problems individually. Demonstrating again sound argumentative competence, participants adopted the correct answer when it was present in the group, and many succeeded in transferring this understanding to novel problems. Moreover, the group member with the right answer nearly always managed to convince the group even when she was not the most confident. These results show that argument quality can overcome confidence among the factors influencing the discussion of intellective tasks. Explanations for apparent exceptions are discussed.

Keywords: group reasoning, intellective tasks, argumentation, confidence, problem solving

Suggested Citation

Trouche, Emmanuel and Sander, Emmanuel and Mercier, Hugo, Arguments, More than Confidence, Explain the Good Performance of Reasoning Groups (May 1, 2014). Journal of Experimental Psychology: General (Forthcoming). Available at SSRN: https://ssrn.com/abstract=2431710

Emmanuel Trouche

University of Lyon 1 - Laboratoire Sur Le Langage, Le Cerveau Et La Cognition (L2C2) ( email )

67, Bd Pinel
Bron, 69675
France

Emmanuel Sander

University of Paris 8 Vincennes-Saint Denis ( email )

Paris
France

Hugo Mercier (Contact Author)

University of Neuchatel ( email )

Espace Louis Agassiz 1
Neuch√Ętel, 2000
Switzerland

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