I'll deal w these two, because they are also at the base of the questions above them.
It's all down to lost food.
Before we had cerebral corteces, we were herd animals who were both hunters & prey (an unusual food-chain position which caused us to develop upper brains in the 1st place). Missed opportunities and mistakes not only meant empty bellies and extra risk, it had direct and severe impact on one's place in the hierarchy of their group. That placement was directly related to how high on the hog one got to eat, whether one got any sumnsumn (8 out of 10 males in herds don'gitnone) and, ultimately, one's tenure in the herd. And, in those days, an ostracized one was soon a dead one.
With one's status at risk, no mate to rub your neck & eat your pests, there was little to do between hunts but cower & rehearse, with very little brain matter to do so. It's why, when you were young and your cerebral cortex not fully wired yet, your brain could literally outrace you at the bus stop or alone on your own. We eventually develop what Jung called The Shadow - a 1a version of oneself who does all the worrying & repetitive work functions and ends up as one's inner tormentor around the time we stop producing growth hormone. It's why we take everything personally and how we can stop taking everything personally. It's an autonomic function, no different than one's reflexes, hormone controls or other routine body processes but, because it's in your brain & your brain operates your personality, you think its you. We invented God and then video games to keep it distracted, but your Shadow actually develops crossover skills processing those kind of things and will gain even more torturous eminence over one later on as a result.
