@sufi The anthropology of traumatic healing processes involving psychedelics, representing whole cultures and single individuals, macro and micro.
Better resolutions of analysis could show the amygdala changing from a system at an acute state of alert to less cortisol and glucose produced, possibly at a genetic level.
That would tweak it beyond a personality degree of openness, which is itself open to anecdote, more to a DNA sequence of mapped change. How the geneticists do this is beyond my knowing.