Fig. 1.

Correlations of cortical gray matter thickness with FSIQ in all participants (t_i = β₀ + β₁ × age + β₂ × age² + β₃ × sex + β₄ × age × sex + β₅ × FSIQ + β₆ × FSIQ × sex, where t_i is the set of cortical thickness measurements for all participants). The color bar indicates the statistical significance of the correlations (purple, negative correlation; red, positive correlation). On the uncorrected maps, gyri with prominent regions of high statistical significance (p < .0001) are labeled: left superior frontal gyrus (SFG), left cingulate gyrus (Cing), left orbitofrontal cortex (OFC), left subgenual region (Sub), and right middle frontal gyrus (MiFG). On the GRF-corrected maps significant Brodmann areas are labeled (p < .0001): BA 10, 11, 25, and 32 on the left (r² = .16) and BA 46 on the right (r² = .20). The brain was scaled during the similarity transformation to the template brain; therefore, measures of cortical thickness inherently accounted for generalized scaling effects within the cerebrum. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of the article.)