Table 1.

Summary statistics for stop-signal task performancy

	Exp. 1: Saccadic	Exp. 2: Simple Unimanual	Exp. 3: 2AFC Bimanual	Exp. 1 vs. 2: P Value	Exp. 1 vs. 3: P Value
Pr(response|no-stop trial)	98.0 ± 1	97.1 ± 2	97.0 ± 2	0.41	0.47
Pr(response|stop-signal)	51.2 ± 3	54.7 ± 2	52.9 ± 2	0.33	0.37
Mean no-stop RT, ms	341 ± 78	525 ± 39	520 ± 33	<0.01	<0.01
Mean noncanceled RT, ms	271 ± 20	448 ± 37	441 ± 37	<0.01	<0.01
Mean SSRT, ms	132 ± 14	227 ± 17	230 ± 15	<0.01	<0.01

All values are means ± SD. Exp, experiment; 2AFC, 2-alternative forced choice; Pr(response|no-stop trial), probability of responding on no-stop trial; Pr(response|stop-signal), probability of responding on stop-signal trial; RT, reaction time; SSRT, stop-signal reaction time. P values are calculated from 2-sample t-tests.