Table 2. Mean activation cluster voxels for each imaging contrast among all groups.

Contrast activation areas	Broadmann area	Cluster size (voxels)	Peak value coordinates
Whole-brain contrast (incongruent–congruent) analysis among all participants
Cluster 1
Right rolandic operculum, right superior temporal gyrus, right heschl gyrus, right insula, right postcentral gyrus, right supramarginal gyrus	13, 22, 40, 41, 42, 43	105	60, −22, 12
Cluster 2
R caudate	125	59	4, 4, 12
Cluster 3
Left inferior frontal gyrus—triangularis, left inferior frontal gyrus—opercularis, left precentral gyrus	9, 45, 46	114	−50, 14, 28
Cluster 4
Left precentral gyrus, left middle frontal gyrus, left postcentral gyrus	6, 8, 9	126	−44, 4, 34
Between-group contrast comparison
Cluster 1
Right rolandic operculum, right insula, right caudate, right supramarginal gyrus	13	232	40, −26, 28
Cluster 2
Left medial superior frontal gyrus, left middle frontal gyrus, left superior frontal gyrus, left inferior frontal gyrus—opercularis	8, 24, 32	110	−28, 14, 34
Between-group comparison with IFG mask
Cluster 1
Left inferior frontal gyrus—opercularis, left inferior frontal gyrus—triangularis, left rolandic operculum, left insula	13	43	−42, 10, 20
Interference regression activation with IFG Mask
Cluster 1
Left inferior frontal gyrus—triangularis, left insula	13, 45, 47	25	−38, 28, 4
Cluster 2
Right inferior frontal gyrus—triangularis, right inferior frontal gyrus—operculum	13, 45	30	42, 24, 12

Abbreviations: IFG, inferior frontal gyrus; MNI, Montreal Neurological Institute.

Contrasts represent activation on incongruent compared with congruent trials, first among all participants and then comparing contrast activations between groups. Interference scores (differences between incongruent and congruent response times) are regressed onto contrast activations in the fourth analysis, using all participants. Significance set a P<0.05 family-wise error correction for multiple comparisons. Coordinates listed are in MNI standard space.