Table 3.

Group differences in functional connectivity of the right IPS

Local Maxima	Clustersize	Peak (T)	Coordinates
			x	y	z
MD > TD
R SMG*	163	4.25	68	−22	30
R STG		3.56	64	−32	12
R SPL*	411	3.99	28	−46	64
R SPL, SMG, angular gyrus (IPS)		3.60	44	−46	56
R lateral occipital cortex, SPL		3.22	16	−58	62
R STG*	161	3.96	60	−2	−4
R precentral gyrus*	485	3.61	30	−18	68
R SFG, precentral gyrus		3.24	20	−8	72
R precentral gyrus		3.14	36	−10	64
L SMG (IPS)*	295	3.55	−50	−34	40
L SMG, SPL (IPS)		3.44	−44	−46	54
L SPL, postcentral gyrus		3.20	−34	−40	66
L SFG, MFG*	218	3.42	−26	8	64
L SFG		3.36	−24	0	64
L precentral gyrus, SFG		3.18	−16	−14	68
L precuneous cortex, SPL, lateral occipital cortex	186	3.16	−8	−58	62
L lateral occipital cortex, SPL (IPS)		3.10	−30	−62	60
L lateral occipital cortex		2.95	−28	−72	52
TD > MD
L precuneous cortex*	252	3.91	−20	−52	10
L precuneous cortex		3.58	−28	−54	8
L precuneous cortex		3.57	−18	−44	16

Note: Results are reported at p < .01, 128 voxels. MNI coordinates are labeled according to the Harvard-Oxford atlas. IPS is defined based on the Juelich atlas. For each cluster, 3 sub-peaks are reported which are more than 8mm apart.

^*= cluster also found in a subset children who scored at or below 85 on the Numerical Operations subtest of the WIAT-II compared with typically developing children. MD = children with mathematical disabilities, TD = typically developing children, IPS = intraparietal sulcus, MFG = middle frontal gyrus, SFG = superior frontal gyrus, SMG = supramarginal gyrus, SPL = superior parietal lobule, STG = superior temporal gyrus.