Fig. S1.

Reaction times for offers where the requirement for self-control is greatest. Here we plot average (mean) reaction times across the group (based on individual means), considering all ‘go’ responses for offers at the start of a trial where the requirement for self-control is greatest (see Fig. 2A, middle panel, yellow boxes). Note that these also represent the set of offers that entered our imaging analyses. Using Grubb's test for outliers, we excluded data from one subject whose mean reaction time for value 7 offers was significantly higher than the group (at a threshold of p < 0.05). Subjects were faster to accept token-value 7 offers compared to value 5 offers, suggestive of a prepotent attraction to 7-token cues. Vertical lines represent SEM. * indicates p < 0.05 (paired t-test).