Group comparisons for Cth.

The contrasts were calculated at p < .05, corrected for multiple comparisons (Monte Carlo permutation), using age as the covariate of no interest. The projection of cerebral hemispheres (MR images of the FreeSurfer atlas) is standardized. Scale is logarithmic and shows–log10(P), with cool colors indicating negative contrast, warm colors positive contrast. The two smaller images at the bottom illustrate Cth in HeM-HoM (left) and HeW–HoM (right) calculated without Monte Carlo correction; they were added to illustrate the HoM differed from both control groups in a similar manner.