Fig. S2.

Exemplar single-subject choice demonstrating variance in the weighting placed on immediate versus long-term value. Plotted above are data from four individual subjects, where each row corresponds to one subject, showing the mean probability of offer acceptance as a function of the number of offers already seen (ranging from 1 to 9) and number of offers already rejected (ranging from 0 to 8) in a trial, split by offer value (3, 5, 7). The spectrum runs from blue (p = 0) to red (p = 1). The top row is representative of a subject who exercises greater self-control with respect to value 7 offers (trade-off 7 closer to 1), with the level of self-control decreasing in row-wise descending order (trade-off 7 equal to 0 in the bottom row). Those with a trade-off parameter closer to 1 are more likely to reject a value 7 offer when the requirement for self-control is greatest (see yellow boxes), whereas those with a trade-off parameter closer to 0 are more likely to accept a value 7 offer regardless of the associated consequences.