Before revision:  Intelligence appears to be associated with widespread increased mean differences and decreased heterogeneity in  cortical thickness . The results seem to support the notion that cognitive function has high heterogeneity . Higher cognitive abilities have lower heterogeneity, and lower cognitive abilities has higher heterogeneity .
After revision:  Intelligence appears to be associated with widespread increased mean differences and decreased heterogeneity in cortical thickness , which may be related to less differentiation or heterogeneity in cortical columns .