Paper Defends Spoken Language in Homo erectus
Acheulean stone tools, Africa, Biological Theory, brain size, brain volume, Denisovans, encephalization quotient, Evolution, FOXP2, genes, Homo erectus, Human Origins, Human Origins and Anthropology, humans, hunting, hyoid, Indonesia, intellectual capabilities, language, laryngeal air sacs, linguistic communication, linguistics, modern humans, Neanderthals, seafaring, speaking, symbols, thinking
The first thing that comes to mind in the context of intellectual capabilities is brain size. Source