The role of group configuration in the social transmission of memory: Evidence from identical and reconfigured groups

Collaborating with others during recall shapes both group and individual memories. Individuals contribute less when recalling in groups than when recalling alone, a phenomenon called collaborative inhibition. In contrast, collaboration improves post-collaborative individual memory by providing re-exposure to information that would have been otherwise forgotten. Collaboration also influences collective memory—the overlap in post-collaborative memory among group members. We examined the role of group configuration on such transmission of memory by varying group configuration across repeated recalls. Participants (N = 162) studied words and completed three recall sessions in one of three conditions (N = 54/condition): Individual–Individual–Individual (Control), Collaborative–Collaborative (Identical group)–Individual and Collaborative–Collaborative (Reconfigured group)–Individual. Collaborative inhibition occurred in both the Identical and Reconfigured groups during the first recall but disappeared in the Reconfigured groups during the second recall. Post-collaborative individual memory was greater following Reconfigured than Identical group collaboration. This pattern reversed for collective memories; repeated collaboration increased overlap in the remembered and forgotten items in Identical groups compared to Reconfigured groups. Finally, Reconfigured groups provided a quantifiable index of the influence of distal partners (i.e., no direct collaboration involved) on post-collaborative individual memory. We conclude that group configuration has powerful consequences on the amount, the similarity and the variety of memory representations.