Research has identified variations in subcortical anatomy between humans and chimpanzees that are associated with heritability patterns related to human behavioral traits. The study of brain anatomy and its variations is a broader area of research, with other studies examining the relationship between brain structure and factors such as socioeconomic status, aging, and sexual orientation. The findings suggest that brain morphology is linked to various aspects of human behavior and development, although the specific details and implications of these connections are still being explored.