Figure S1. Comparison of prefrontal (PFC), ventral striatum (VS), and orbitofrontal (OFC) regions-of-interest (ROI). Left panel presents statistical maps of for each ROI.  Middle panel presents scatterplots, provided for descriptive purposes, indicating the correspondence between age and the neural peer effect (βpeer - βalone) within each ROI. Right panel presents, for each age group, activity observed for GO relative to STOP trials. Estimated activity was averaged over the 4 peak voxels in each ROI.  Error bars indicate standard error of the mean.

Table S1. Average total driving time (in seconds) across age groups  and social contexts

Table S2. Regions showing significant (FWE<.05) main and interactive effects of age and social condition in association with Stoplight task outcomes.

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