I'm unsure how this "kernel" isn't socially created too. Whether we decide to act like those around us, or different than them, is irrelevant. The article is s

I'm unsure how this "kernel" isn't socially created too. Whether we decide to act like those around us, or different than them, is irrelevant. The article is saying that just having someone around us to interact with in some way is vital for our brain to even function. Introverts still have plenty of social interaction -- maybe not in the small area of recreational socialization that gets so much attention from extroverts, but our society is still made up of a bunch of people. You have to interact with them to do much of anything.