Larson, J. R., Jr., Christensen, C., Franz, T. M., & Abbott, A. S. (1998).
Diagnosing groups: The pooling, management, and impact of shared and unshared
case information in team-based medical decision making. Journal
of Personality and Social Psychology, 75, 93-108.
Abstract. The impact of group discussion on the decision-making
effectiveness of medical teams was examined. Three-person teams of
physicians diagnosed 2 hypothetical medical cases. Some of the information
about each case was given to all team members prior to discussion (shared
information) whereas the rest was divided among them (unshared information).
Compared to unshared information, shared information was more likely to be
pooled during discussion and was pooled earlier. In addition, team
leaders were consistently more likely than other members to ask questions
and to repeat shared information and, over time, also became more likely
than others to repeat unshared information. Finally, pooling unshared
(but not shared) information improved the overall accuracy of the team diagnoses,
whereas repeating both shared and unshared information affected bias (but
not accuracy) in the diagnoses.