Table 1.

Behavioral performance in the stop signal task

SSRT group	SSRT (msec)	FP effect*	Median go RT (msec)	%go	%stop	Frustration rating	SSD (SS)	SSD (SE)	PES*
Short	165 ± 22	2.76 ± 1.16	569 ± 140	97.0 ± 1.8	50.8 ± 1.7	3.3 ± 1.0	361 ± 141	420 ± 148	1.78 ± 1.33
Long	228 ± 30	1.98 ± 1.59	602 ± 128	97.2 ± 1.8	51.2 ± 1.9	3.1 ± 0.7	352 ± 131	406 ± 125	1.33 ± 1.86
P value	<0.0001	0.136	0.507	0.728	0.523	0.436	0.853	0.789	0.447

Note: FP: fore-period; %go and %stop: percentage of successful go and stop trials; SSRT: stop-signal reaction time; SSD: stop signal delay for stop success (SS) and stop error (SE) trials; PES: post-error slowing;

^*effect size; all values are mean ± standard deviation; P value based on 2-tailed 2-sample t test except for frustration rating using Mann Whitney U test. Note that the SSD reported here is not the “critical SSD” used to compute SSRT (see Methods).