I still think this is the major effect that makes it harder for adults to learn a foreign language. Brain chemistry changes a little between child and adult but

I still think this is the major effect that makes it harder for adults to learn a foreign language. Brain chemistry changes a little between child and adult but your resistance to social inferiority signals changes a lot. If you can reach a zen state of submission to the ocean of expression around you and follow the currents, you could learn like a child again. That's dang hard to do.