(a,d) Intertemporal (top) and risky (bottom) choice task design. Every 15 trials, participants were presented with either ‘Self’ or ‘Other’ to indicate for whom they would be making choices in a given block. Each trial involved the presentation of two options, and participants were given the opportunity to indicate their choice either for themselves or for another participant in the study with a left or right button press. (b,e) Summed Bayesian information criterion (BIC) for the one and two discounting or risk parameter models for the intertemporal (top) and risky (bottom) choice tasks, respectively. For each of these models, variants with a common β parameter or two β parameters, one for Self and one for Other trials, were also included. Downward arrows indicate the best fitting model as determined via lowest BIC. (c,f) Self minus Other discounting parameters (k) or risk parameters (α) for the intertemporal (top) and risky (bottom) choice two-parameter models, respectively, each with one β parameter. For each analysis, participants were median-split into either high or low discounting or risk tolerance based on the value of their fitted k or α parameters for Self trials. Data are plotted as box plots for each condition in which horizontal lines indicate median values, boxes indicate 25–75% interquartile range and whiskers indicate minimum and maximum values; data points outside 1.5x the interquartile range are shown separately as crosses. *** indicates p=0.005, Wilcoxon signed rank test. N = 20 participants for intertemporal choice with 10 high-discounting and 10 low-discounting individuals, N = 21 for risky choice with 11 high-risk tolerance and 10 low-risk tolerance individuals.