Table 2.

Behavioral performance in the stop-signal task

Variable	HCs (n = 24)	iHUDs (n = 41)	Significance test	Effect size (Cohen's d)	95% CI
Stop accuracy	0.48 (0.04)	0.47 (0.07)	t(62.99) = 0.59, p = 0.556	d = 0.134	−0.02, 0.03
Go accuracy	0.98 (0.02)	0.95 (0.05)	t(60.92) = 2.95, p = 0.004*	d = 0.640	0.01, 0.04
SSRT	277 (40.9)	276 (67.0)	t(62.85) = 0.05, p = 0.960	d = 0.012	−26.10, 27.40
SSD	288 (94.8)	313 (143)	t(61.91) = 0.83, p = 0.412	d = 0.191	−83.50, 34.60
Go RT	585 (83.3)	633 (131)	t(62.48) = 1.79, p = 0.078	d = 0.411	−100.71, 5.51
d′	0.62 (0.04)	0.57 (0.08)	t(62.80) = 3.07, p = 0.003*	d = 0.683	0.02, 0.08

Significant group differences (corrected for familywise error, α = 0.05/6 = 0.008) are flagged with an asterisk. Values in parentheses denote SD. Go accuracy was calculated as go responses divided by the total of correct and incorrect go responses.