The theory that early Homo species had sufficiently developed brains for grammar is also supported by researchers who study brain development in children, noting that grammar is developed while connections across the brain are still significantly lower than adult level.
Teoriju da su prvobitne vrste roda Homo dovoljno razvile mozak za gramatiku takođe podržavaju istraživači koji proučavaju razvoj mozga kod dece, i oni primećuju da se gramatika razvija dok su veze u mozgu još uvek na znatno nižem nivou nego kod odraslih.