I say pre because these systems existed before a central state-backed currency, and post because these systems will exist after.
When a central currency isn't working to animate a given social sector, that sector begins to trade directly in favors and resources. It easy to see the need for centralized currency given the demands of the increasing complexity of a centralizing system. This constant trade of favors and resources is quite a bit of work and can be stressful, as it implies maintaining the human relationships themselves.
It is probable that the neural circuitry itself changes. You begin thinking of individuals as extensions of a vessel you are maintaining. It becomes less about what you personally can do or take, and more about what you are putting into this system which you act on, and which acts on you.
