Fig. 2: Behavioral results.

a Coins collected per incentive condition and environment (concentrated in blue, distributed in green). Each circle represents one round per participant (n = 160 participants), larger filled dots represent posterior means (as well as 90% HPDIs) from a Bayesian multilevel Poisson model. b Performance differences between incentive conditions (positive values indicate an advantage for group incentives), computed as the probability of exploiting a patch in 1-minute intervals (posterior means and 90% HPDIs; n = 160). c Posterior scrounging rates (conditional probabilities that players join a patch where they had observed at least one exploiting group member) per incentive condition and environment. d Average number of coins collected per individual as a function of individual-specific scrounging rates (with 90% HPDIs; top; n = 160) and per group as a function of forager density (i.e., average number of players exploiting a given patch; bottom; n = 40). e (Average) number of coins per round per individual (top; n = 160) and group (bottom; n = 40) in concentrated and distributed environments as a function of distance (standardized average distance to other players). Lines and uncertainty intervals show effects from multilevel regressions accounting for baseline differences between incentive conditions and individual and group-level variability in both intercepts and slopes (transparent text if 90% HPDI overlaps 0).