This era of early tool development took place during the Lower Paleolithic and was known as the Oldowan Tool Tradition. Anthropologists suspect that a vicious circle between brain size, behavior and language began to develop during the time of Homo habilis, due to a proposed correlation between the gradual increase in brain complexity and size and the development of more complex cultural aspects of their brain. society, such as the various tools developed during the era of the habilis species. The arrival of Homo erectus, about 2 million years ago, marked another remarkable progression of biological and cultural adaptation, as well as further evidence supporting the feedback loop