When I am saying temperament I am thinking largely genetic components, things like being fussy/calm. A blow to the head can lead to a permanent change, taking out the part of you that inhibits impulses for example. A harsh upbringing can build wiring differently (People with PTSD often have hair trigger perception, and they also respond differently to their impulses) I am curious about "permanent" changes due to the environment. But harsh conditioning as in mind control is overkill, you could brainwash someone much more easily with just getting them to change the stories they tell themselves.
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