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. 2016 Feb 18;6:20767. doi: 10.1038/srep20767

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In all three conditions, groups started with one round of only a contribution stage, followed by round 2, consisting of a contribution stage and a punishment stage. In round 3, the experimental manipulation was introduced. In the endogenous condition, representing the power transfer game, group members were able to transfer power to other group members before the contribution and punishment stages. Each exogenous condition group mirrored the power transfers of one endogenous condition group and thus group members were not able to transfer power voluntarily. In the fixed condition, power transfers were not possible, and everyone’s power was fixed to 1. Rounds 4 to 20 had the same structure as round 3, according to the condition.