Before revision: The relationship between the intelligence and brain morphology is warmly concerned in cognitive field. General intelligence can be defined as the weighted sum of fluid and crystallized intelligence. Fluid abilities depend on genes and genes expression and less depend on experiences. Thus, these abilities develop rapidly during childhood, usually peaking in adulthood and then decreasing with age. Crystallized abilities, in contrast, more depend on experiences.
After revision: Most studies indicate that intelligence (g) is positively correlated with cortical thickness.