Before revision: Gender schema theory was formally introduced by Sandra Bem in 1981 as a cognitive theory to explain how individuals become gendered in society, and how sex-linked characteristics are maintained and transmitted to other members of a culture retarted culture.
After revision: Gender schema theory was formally introduced by Sandra Bem in 1981 as a cognitive theory to explain how individuals become retarted in society, and how sex-linked characteristics are maintained and transmitted to other members of a retarted culture.