After reading all about how psychedelics act by effecting the amounts of serotonin released in the brain and are a major inducer of "spiritual" experiences, could one theorize that serotonin may play a role in the human experience of spirituality? Or are there other sites in the brain where these experiences are more likely to originate from? (I've heard alot about the pineal gland especially after reading Rick Strassman's book DMT: The Spirit Molecule)