Table 1.

Foci of activation

Anatomical region	BA	Voxel count	Stereotaxic coordinates, mm			Maximum t (average t)
			x	y	z
Left medial frontal gyrus (SMA)	6	30	−1	−2	55	9.68 (7.41)
Right medial frontal gyrus (SMA/pre-SMA)	8	8	7	18	43	8.35 (7.28)
Right precentral sulcus (premotor)	6	93	33	−8	51	13.01 (8.03)
Left precentral sulcus (premotor)	6	25	−22	−19	51	8.75 (7.25)
Right superior frontal gyrus (DLPFC)	9	8	45	37	32	8.98 (7.54)
Left inferior frontal gyrus	44	19	−42	5	27	16.71 (8.95)
Left/right parietal	7	233	−7	−59	51	23.05 (8.07)
Left/right precuneus	7
Left/right angular gyrus	39
Left/right inferior parietal lobule	40
Left precuneus	31	8	−3	−71	27	7.37 (6.96)
Right cuneus	18	16	22	−67	16	9.64 (7.40)
Left cuneus	18	18	−22	−77	20	11.80 (7.94)
Right caudate nucleus		23	18	5	27	9.58 (7.80)
Left/right thalamus		169	1	−19	12	15.21 (7.96)
Left/right anterior cingulate	24	21	−7	33	12	9.20 (7.66)

Activation foci sensitive to number of planning steps as identified by between-subject voxel-wise t tests of the ACT-R(t) model coefficient in the linear model of the MR signal (see Analysis). Only regions with eight or more contiguous active voxels (significant at level P < 0.0005) are reported. Coordinates refer to location of maximal activation in Talairach space.