Evidence accumulation, not 'self-control', explains dorsolateral prefrontal activation during normative choice.

(We thank Todd Hare for generously sharing a mask of this ROI with us.) In Dataset 1 (unregulated altruistic choice), we replicated the result from the main manuscript that the dlPFC is more activated on generous compared to selfish choices (t 43 =2.09, p=0.04, Appendix 2—figure 1g ), and similarly observed a marginally significant correlation with difference in weights on self vs. other (r=–0.27, p=0.08).

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unhealthy choice fell short of significance (F 2,177 = 2.32, p=0.099, Appendix 2—figure 1i ), planned post hoc comparisons showed similar effects to the ROI reported in the main paper.

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Instead, selfish choices elicited greater activation, although the effect did not reach statistical significance.

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unhealthy choices elicited comparable dlPFC responses (paired-t 97 =0.86, p=0.39, Cohen’s d=0.09, within-condition comparison) and even showed a trend toward greater activity for unhealthy choices.

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