Together, slowly but surely: the role of social interaction and feedback on the build-up of benefit in collective decision-making.

Without feedback ( Figure 4 , gray dashed line), significant collective benefit was only achieved in the second session, (one-sample t test, for Session 1, t (14) = 0.7, p > .5; for Session 2, t (14) = 5.6, p < .001), and a remarkable impact of social interaction over time was demonstrated by a highly significant difference between the two sessions, paired t test, t (14) = 4.5, p < .001.

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