Preferential looking to eyes versus mouth in early infancy: heritability and link to concurrent and later development
BACKGROUND: From birth, infants orient preferentially to faces, and when looking at the face, they attend primarily to eyes and mouth. These areas convey different types of information, and earlier research suggests that genetic factors influence the preference for one or the other in young children.METHODS: In a sample of 535 5-month-old infant twins, we assessed eye (relative to mouth) preferenc