ISSN 1671-3710
CN 11-4766/R

Advances in Psychological Science ›› 2016, Vol. 24 ›› Issue (1): 132-142.doi: 10.3724/SP.J.1042.2016.00132

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Shared information bias in group decision-making: Based on hidden profile paradigm

CHEN Ting; SUN Xiaomin   

  1. (School of Psychology, Beijing Normal University, Beijing Key Laboratory of Applied Experimental
    Psychology, Beijing 100875, China)
  • Received:2014-11-24 Online:2016-01-15 Published:2016-01-15
  • Contact: SUN Xiaomin, E-mail:


In decision-making tasks, groups are often expected to achieve better decision quality than individuals because groups possess various information from their members. But a lot of research results showed that groups are not as effective as expected in using the various information. Groups tend to focus more on the information possessed by all members (shared information) than on the information possessed by an individual member (unshared information). This phenomenon is called “Shared Information Bias “(Stasser & Titus, 1985). The existence of shared information bias hinders the groups from achieving better decision quality. Based on the hidden profile paradigm, this paper illustrated the mechanisms of shared information bias from four perspectives, namely information sampling model, dynamic collective information sampling model, mutual enhancement effect, and preference effect. Also, this paper summarized the roles of four influential factors including information distribution, group task characteristics, member characteristic, and motivation factors. Future researches could focus on combining the team cognition, exploring the influences of affective factors, and integrating the group decision effectiveness model.

Key words: shared information bias, hidden profile paradigm, group decision-making, information sharing