Figure 10.

Urgency signal mediates a speed-accuracy trade-off. A GDDM with a delayed collapse urgency signal and leaky integration was fit to each monkey's RT data in the color matching task with timing blocks. Using these parameters, the “collapse delay t₁” parameter was varied systematically across the linearly spaced values from 0 to 1, representing the hypothetical case in which the subject could control this parameter while leaving the other parameters fixed. For each value, the mean RT and probability of a correct response were plotted for the long-presample (dotted lines) and short-presample (solid lines) blocks. Filled dots represent the actual parameters.