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Most studies indicate that intelligence (g) is positively correlated withcortical thickness. However, the interindividual variability of corticalthickness has not been taken into account. In this study, we aimed to identifythe association between intelligence and cortical thickness in adolescents fromboth the group's mean and dispersion point of view, utilizing the structuralbrain imaging from the Adolescent Brain and Cognitive Development (ABCD)Consortium, the largest cohort in early adolescents around 10 years old. Themean and dispersion parameters of cortical thickness and their association withintelligence were estimated using double generalized linear models(DGLM). Wefound that for the mean model part, the thickness of the frontal lobe likesuperior frontal gyrus was negatively related to intelligence, while thesurface area was most positively associated with intelligence in the frontallobe. In the dispersion part, intelligence was negatively correlated with thedispersion of cortical thickness in widespread areas, but not with the surfacearea. These results suggested that people with higher IQ are more similar incortical thickness, which may be related to less differentiation orheterogeneity in cortical columns.

Double Generalized Linear Model Reveals Those with High Intelligence are More Similar in Cortical Thickness