Table 2.

Fitted parameter values for the average participant (pooled data from all participants). Data from Experiment 1 and Experiment 2 were fit simultaneously, leading to parameter values identical to Table 1 for all parameters other than threshold, starting point, mixture weight and drift increment.

Pooled participant data, unequal stimulus probabilities
Parameter	Value
Drift A:	0.17348
Noise coefficient c:	0.1
Residual latency T0:	345.47 msec
(compare to avg. signal detection RT of 301 msec)
Drift std dev sA:	0.068683	Bound: 0.08
Start range sx:	0.03	Bound: 0.03
T0 range st:	0.1	Bound: 0.10
Contaminant proportion p0:	0.029182	Bound: 0.05
Fast-guess RT mean:	266.77 msec	Bound: 290
Fast-guess RT std dev:	49.099 msec	Bound: 100
Total χ2 fit error:	1020.104

Stim prob:	60:40	75:25	90:10
Threshold z
RSI: 500 msec	0.049545	0.055035	0.062455
1 second	0.052885	0.05222	0.059620
2 second	0.062745	0.06289	0.064055
Optimal thresh
RSI: 500 msec	0.043370	0.040829	0.033304
1 second	0.056341	0.054623	0.049731
2 second	0.072819	0.071804	0.069020
Starting point x0
RSI: 500 msec	0.000915	0.012183	0.021868
1 second	0.004557	0.010700	0.011437
2 second	0.003909	0.005578	0.011804
Optimal start pt
RSI: 500 msec	0.011686	0.03166	0.063330
1 second	0.011686	0.03166	0.063330
2 second	0.011686	0.03166	0.063330
Mixture weight
RSI: 500 msec	0.079295	0.48188	0.84125
1 second	0.031668	0.22471	0.70061
2 second	0.016402	0.13526	0.45467
Drift increment
RSI: 500 msec	0.01536	0.00377	0
1 second	0.00304	0.0001	0.083964
2 second	0	0.03522	0.057137
χ2 fit error
RSI 500 msec	92.91	110.90	297.86
1 second	54.31	30.06	112.14
2 second	97.53	74.12	150.27