Figure 2.

Behavior. A, Proportion of options accepted varied with both reward amount and delay. Colors indicate reward sizes as indicated by Figure 1B. B, Acceptance rate rose with profitability of option. Gamble options were excluded from this analysis. Blue line indicates best-fit logistic line. Red line is the optimal threshold (see Materials and Methods for optimality calculation details). C, Monkeys had a larger acceptance rate for gambles than would be expected based on the profitability of gambles. Blue line indicates the estimated acceptance rate for gamble options based on line fit from B. Blue-red dashed line indicates actual gamble acceptance rate. For all panels, error bars are smaller than the lines.