Tobias Greitemeyer, Stefan Schulz-Hardt, and Dieter Frey (2003)

Präferenzkonsistenz und Geteiltheit von Information als Einflussfaktoren auf Informationsbewertung und intendiertes Diskussionsverhalten bei Gruppenentscheidungen

Zeitschrift für Sozialpsychologie, 34(1):9-23.

Group discussions tend to focus on information that is already known to all group members prior to discussion (shared information) relative to information that is known to only one group member (unshared information). Further, group decisions are more strongly determined by shared information. However, in most of the pertinent studies, sharedness of information was confounded with preference-consistency; that is, most of the shared information supports the predominant sentiment in the group. A simulated group discussion revealed that shared information - independent of preference consistency - was evaluated as more credible and relevant and was intended to be repeated more often than unshared information. The same effect was observed for preference-consistency of information, independent of sharedness of information. In addition, participants preferred to discuss and request preference-consistent information. The results point out that individual processes of information evaluation and information preference contribute to the dominance of shared information in group discussions and group decisions.