Table 1.

Parameters for model fits^a

Task	Monkey	κ	B	C 0	${\kappa }_{\text{opp}}$	λ
Cued attention	Dm	7.9	0.74	–0.047	4.6	0.029
Cued attention	Np	17.9	0.44	–0.011	7.9	0.006
Variable location	Dm	10.3	0.64	0.013	—	—
Variable location	Ap	11.4	0.61	–0.001	—	—
Variable location (FR)	Dz	17.1	0.74	–0.02	—	—

^aVariables are defined in Equations 2, 4, and 5. Free response task (FR) includes two additional parameters: the expectations of the nondecision times, $T_{\text{nd}}^{\text{right}}=0.33$ and $T_{\text{nd}}^{\text{left}}=0.34$, which accounts for sensory and motor latencies that add to the decision time to explain the total response time.