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Personality and Social Psychology Bulletin
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Hidden Profiles and Concealed Information: Strategic Information Sharing and Use in Group Decision Making

Claudia Toma

University of Grenoble

Fabrizio Butera

University of Lausanne, fabrizio.butera{at}unil.ch

Two experiments investigated the differential impact of cooperation and competition on strategic information sharing and use in a three-person group decision-making task. Information was distributed in order to create a hidden profile so that disconfirmation of group members' initial preferences was required to solve the task. Experiment 1 revealed that competition, compared to cooperation, led group members to withhold unshared information, a difference that was not significant for shared information. In competition, compared to cooperation, group members were also more reluctant to disconfirm their initial preferences. Decision quality was lower in competition than in cooperation, this effect being mediated by disconfirmation use and not by information sharing. Experiment 2 replicated these findings and revealed the role of mistrust in predicting strategic information sharing and use in competition. These results support a motivated information processing approach of group decision making.

Key Words: cooperation • competition • information sharing • disconfirmation • group decision making

This version was published on June 1, 2009

Personality and Social Psychology Bulletin, Vol. 35, No. 6, 793-806 (2009)
DOI: 10.1177/0146167209333176
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