The human body and the human mind are perfectly fitted to one another. They co-evolved. Any fundamental change in the human brain would imply a fundamental cha

The human body and the human mind are perfectly fitted to one another. They co-evolved. Any fundamental change in the human brain would imply a fundamental change in the human form, to enable acting on the enhanced understanding. Otherwise, the enhanced understanding would be useless for survival. The contrapositive would mean that for as long as the human form has been about the same, human ingenuity and creativity have also remained about the same. If you want to locate when human creativity and ingenuity began, it will have been at or before the basic structure of the hands, larynx, feet, eyes, etc. came to be.