Fixed terms of the generalized linear mixed model (GLMM) to determine possible influences on actors' choices (N = 560 trials and 7 individuals).

The binomial response variable was selfish/cooperative actor's choice in the prosocial and the altruistic condition. Actor identity was included as a random term in all models. For the full model, results of all tested fixed terms are given. For the final model, results of terms that remained in the final model are given straight with significant effects (p