Since cultural universals are found in all cultures including some of the most isolated indigenous groups, these traits must have evolved or have been invented in Africa prior to the exodus.
Karena universal kultural ditemukan disemua kultur termasuk kelompok pribumi yang paling terisolasi, ilmuwan percaya bahwa sifat tersebut pastilah berevolusi atau diciptakan di Afrika sebelum terjadinya persebaran.