Table 1.

Gray matter areas with a positive correlation between intelligence and regional volume

Brain region	Side	t value	x	y	z	Size (mm³)
Frontal lobe
Inf frontal g	R	5.31	29	65	−2	18462^a
		5.00	51	41	−12
		5.25	58	25	1
Middle frontal g	L	3.11^b	−31	61	5	39
Sup frontal g	L	3.10	−18	60	6	21
Sup frontal g	R	4.00	7	59	4	6287^c
		3.79	9	58	12
Cingulate g	R	4.03	9	53	−5
Inf frontal g	L	4.24	−48	40	−16	653
		3.25	−51	33	−11
		3.11^b	−55	30	−4
Inf frontal g	L	3.19	−58	22	11	15
Middle frontal g	R	3.18	45	18	48	280
Precentral g	R	3.26	49	−1	50
		3.47	44	−7	46
Inf frontal g	L	3.58	−43	15	8	2057
		3.25	−51	11	13
3.74	−56	9	4
Cingulate g	L	4.57	−9	9	31	3131
		4.25	−9	−29	32
		3.57	−7	−19	32
Sup frontal g	Mid	4.31	−3	−10	72	1332
Precentral g		3.09	1	−23	69
Cingulate g	R	3.46	10	−15	35	274
		3.02	12	−22	41
Parietal and temporal lobes
Postcentral g	L	3.33	−64	−9	22	54
Supramarginal g	R	5.19	50	−38	26	26549^d
Middle temporal g		4.41	50	−46	1
Supramarginal g		4.44	51	−55	42
Sup temporal g	L	3.02	−47	−38	11	1114
		3.84	−56	−41	16
Inf temporal g	L	3.40	−63	−58	−8	4839
Middle temporal g	L	4.31	−61	−65	−1
		4.81	−53	−68	4
Angular g	R	3.21	44	−58	24	39
Angular g	L	3.08	−56	−62	35	27
Angular g	L	4.18	−44	−72	26	1069^e
Subcortical
Hypothalamus	Mid	3.10	−1	7	−16	312
		3.56	−3	−3	−18
Cerebellum, lobule VI	L	3.06^b	−28	−51	−27	38

Significantly correlated (p < 0.05) regions with an extent of more than five voxels are reported, in rostrocaudal order within each lobe. The coordinates in Montreal Neurological Institute (MNI) space and t values of the three most significant peak voxels of each cluster are given. When controlling for age, trends at p = 0.08 were found for all peaks, except for three peaks that were significant at p = 0.09 (see footnote at the respective t value). g, Gyrus; Inf, inferior; Sup, superior; L, left; R, right.
↵^aThe cluster extended rostrocaudally from y = 6 in the inferior frontal gyrus to the frontal pole; in its rostral part, it extended dorsally into the right middle and superior frontal gyri and ventromedially into orbitofrontal cortex.
↵^bThe peak had a trend for significance at p = 0.09 when controlling for age.
↵^cThe cluster extended caudally in the right cingulate gyrus to y = 16.
↵^dThe cluster extended dorsoventrally from the postcentral sulcus to the inferior temporal and fusiform gyri, in posterior parietotemporal cortex.
↵^eThe cluster extended caudally into the middle occipital gyrus.