Willingness to cooperate
We analyzed ratings of willingness to cooperate using a three-way mixed ANOVA with outcome feedback (victory vs. defeat vs. uncertain competitive outcome vs. control) as a between-participant factor, person (self vs. opponent), and MPCR (α = 1.4 vs. α = 2 vs. α = 3) as the within-participant factor. We observed a significant main effect of both outcome feedback (Effects of outcome feedback and the MPCR on participants’ willingness to cooperate and their cooperative behavior. With regard to participants’ willingness to cooperate with their opponents (