The self-interest of adolescents overrules cooperation in social dilemmas.

Overall, the patterns replicated those observed for the Group effect: the Previous trial ×Partner’s choice ×Age interaction was significant in GLMM sup 1 ( b =0.02, 95% CI = [0.001, 0.036], p =0.038, see Appendix 1—table 5 ) and LMM sup 3 ( b =0.04, 95% CI = [0.031, 0.046], p<0.001, see Appendix 1—table 8 ), and marginally significant in LMM sup 1 ( b =0.0012, 95% CI = [ − 1.63 × 10 − 7 , 0.002], p=0.050, see Appendix 1—table 6 ).

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