Figure 6.

Leaky integration improves model fit nonuniformly. All models shown in Figure 6 were subsequently fit to the exploration data with leaky integration disabled. The difference in HOLL on the validation data is shown, with larger ΔHOLL indicating a larger effect of leaky integration. As in Figure 6, models involving one reward mechanism and one urgency signal (a, b) as well as models involving two timing mechanisms in conjunction with the delayed collapse urgency signal (c, d) were examined for Monkey 1 (a, c) and Monkey 2 (b, d). Overlaid are leaky integration time constants in units of milliseconds for each model.