Figure 1. Social conditions within the multi-person decision making tasks.

Participants played each task under a social condition that determined what information was available about other group members. In the No Information condition, participants played a task without social information. In the Choices condition, the button previously chosen by each other group member was shown, and was updated for each decision. In the Rewards condition, the number of points earned by each other group member was shown, and was updated synchronously as in the Choices condition. Finally, the Both condition displayed both Choices and Rewards information on each trial.