Table 3.
White matter regions in which regional volume correlated positively with intelligence and negatively with tapping variability
| Brain region (nearest gray matter) | Side | Size (mm3) | t value | x | y | z | Explained portion of variance in intelligence |
||
|---|---|---|---|---|---|---|---|---|---|
| WMV (unique) | CV (unique) | Commonality | |||||||
| Frontal pole | R | 274 | 3.44 | 16 | 55 | −12 | 0.07 | 0.00 | 0.15 |
| Middle frontal g | R | 1041 | 4.48 | 26 | 46 | 19 | 0.15 | 0.00 | 0.15 |
| Inf frontal g/orbitofrontal cortex | R | 1113 | 3.76 | 26 | 39 | −12 | 0.13 | 0.00 | 0.15 |
| Middle orbitofrontal g | L | 19 | 3.08 | −24 | 31 | −16 | 0.09 | 0.00 | 0.15 |
Significantly correlated (p < 0.05) regions with an extent of more than five voxels are reported. All peaks remained significant when controlling for age. The coordinates in MNI space and t value of the peak voxel of each cluster are given. The three rightmost columns give, for each cluster, the proportion of total variance in Raven scores explained by cluster WMV and CV scores uniquely, as well as by common effects of these two variables. g, Gyrus; Inf, inferior; L, left; R, right.