Modestly speaking I am not an expert in your field. But let me interject mine conviction.
Behaviors are inherited through genes.
People have from birth behaviors similar to their ancestors - even if you have never had contact with them. Some experiences are inherited for many generations. For example, the experience of being a slave. And I do not mean afro-american - but white Europeans - whose ancestors were mostly slaves. Just observe their behavior on a daily basis. These passive. It's easy to give up. They do not protest even when their rights are violated. And their desire to come down to the most primitive needs: eating, drinking and reproduction. Such examples can be cited more.
Tell me, who were your ancestors - and I'll tell you how you will behave.
I think it is a matter of purely biological, not psychological. And so strong that there are people who are able to remember what happened to their ancestors. The limit is the date of conception - the transfer of genes.