Summary of the games used in the experiment and their equilibria

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Fig. 1 Summary of the games used in the experiment and their equilibria. Summary of the games used in the experiment and their equilibria. Schema with labels to help identify each one of the games in the quadrants of the (T, S) plane (left), along with the symmetric Nash equilibria (center) and average empirical cooperation heatmaps from the 8366 game actions of the 541 subjects (right), in each cell of the (T, S) plane. The symmetric Nash equilibria (center) for each game are as follows: PD and HG have one equilibrium, given by the pure strategies D and C, respectively. SG has a stable mixed equilibrium containing both cooperators and defectors, in a proportion that depends on the specific payoffs considered. SH is a coordination game displaying two pure-strategy stable equilibria, whose bases of attraction are separated by an unstable one, again depending on the particular payoffs of the game (5, 6, 43). The fraction of cooperation is color-coded (red, full cooperation; blue, full defection). Julia Poncela-Casasnovas et al. Sci Adv 2016;2:e1600451 Copyright © 2016, The Authors