Shared information is information that members hold in common before discussion. In Stasser and Titus’s four-person political caucus simulation, pooled candidate information favored one candidate while members’ separate subsets favored alternatives. Group choices tended to preserve initial preferences, and recall after discussion emphasized shared and preference-supporting information. Having useful unshared evidence did not ensure effective pooling in this judgmental, consensus-requiring task. These choice and recall outcomes do not directly establish discussion frequency or effects in human–AI teams.

Stasser and Titus (1985)