When groups collaborate to share information, they experience collaborative inhibition, a decrease in performance compared to the memory performance of individuals. Basden, Basden, Bryner, and Thomas (1997) provided evidence that retrieval interference underlies collaborative inhibition, as hearing other members' thoughts and discussion about the topic at hand interferes with one's own organization of thoughts and impairs memory. Additionally, motivational mechanisms may also account for this memory deficit in groups due to social loafing. Explanations for this include: