Table 3.

Comparison of non-user versus problem-user groups in ROI activation

Region	Non-Users		Problem-users		t (df=24)	p	d
	Mean	SEM	Mean	SEM
Correct Inhibition
L IFG/Insula	1.25	0.54	1.36	0.54	−0.15	0.885	0.06
R Middle Frontal Gyrus	1.06	0.63	0.52	0.40	0.72	0.482	0.28
L Middle Frontal Gyrus	1.50	0.65	0.65	0.55	1.00	0.329	0.39
Supplemental Motor Area	0.76	0.22	0.95	0.18	−0.66	0.513	0.26
R Inferior Parietal Lobe	1.04	0.65	0.25	0.24	1.13	0.269	0.44
R Caudate	2.05	0.86	1.09	0.29	1.06	0.301	0.41
Failed Inhibition
R IFG/Insula	1.16	0.80	1.39	0.62	−0.22	0.828	0.09
R Middle Frontal Gyrus	0.94	0.54	0.40	0.34	0.83	0.414	0.32
L Middle Frontal Gyrus	1.32	0.29	0.50	0.19	2.31	0.030	0.91
Anterior Cingulate	2.20	0.61	1.32	0.50	1.10	0.283	0.43
Failed Inhibition > Correct Inhibition
L Middle Frontal Gyrus	1.53	0.32	0.22	0.21	3.40	0.002	1.36

L, Left; R, right; d, Cohen’s d effect size