Table 2. Stop-signal task performance measures.

Task measure	Recreational		Control subjects		t	P
	Mean	s.d.	Mean	s.d.
Go RT (ms)	386.53	46.30	410.91	76.17	1.38	0.17
SSRT (ms)	198.36	36.92	198.38	59.12	0.01	0.99
Percent errors (on go trials)	3.71	3.19	3.17	2.43	0.72	0.47
Percent unsuccessful stopping	50.13	1.70	49.11	2.18	1.91	0.06
Go s.d. (ms)	90.81	24.69	91.54	34.71	0.09	0.93
Slowing following an unsuccessful stop (ms)	22.82	36.21	30.04	54.82	1.13	0.26

Abbreviations: RT, reaction time (in ms); SSRT, stop signal reaction time (in ms).

Go s.d. denotes the individual standard deviation of go RT.