 Cortical asymmetry is a common feature of the human brain, with differences between the left and right hemispheres being present from birth. These differences can be seen in both the thickness and surface area of the cortex, as well as in the shape of the brain itself. This asymmetry has been observed in many different populations, and is thought to be influenced by both genetic and environmental factors. The study found that the asymmetry of the cortex is largely stable throughout life, with the exception of a peak in early adulthood when the cortex becomes thicker on the left side than the right. Additionally, the study found that the asymmetry of the cortex is associated with cognitive abilities, such as verbal fluency and working memory. This article was authored by James Emerow, DiDec Vidalpano, Indicaeanlion, and others.