wrong, so so wrong, surviving in the pre technolgical stone age world required the ability to comunicate very very precisely, and self evaluate, and also for elders to make decisive decisions that were constantly and neverendingly central to the groups survival, a shallow dive into the size and composition of neo lithic tribes, there environment, and the very sophisticated use of the resources spread over wide goegraphic areas is nessesary, before comenting on what those people were capable of, and what was important and central to them bieng able to thrive. there truths were tested in inumerable ways,and our existence is the proof of there rationality, and nothing less