Ah, I've started reading that post but somehow got distracted and filed it away as already finished! Shame on me, I should have picked up on the fact that you've mentioned the ventral striatum and the part cingulate cortex that are mentioned in the article from Psychology Today. (Not that I've much of brain topology and function committed to memory though).

As for the person self-administering psilocybin... You probably already know this, and in fairness I should have mentioned it in the first place, but it's rather important to not take it without a sober partner to observe the effects and restrain you if necessary... I hope they're all right.