sense of self with heady mixtures of ritual and dimethyltryptamine. In neurology, Oliver Sacks and others have chronicled the many ways in which the self falls apart following brain disease or damage, while split-brain patients – who we met in chapter 3 – raise the possibility that one self might become two. Most curious of all are craniopagus twins, who are not only physically conjoined but also share some of their brain structures. What could it mean to be an individual self, when it turns out that one craniopagus twin can feel the other drinking orange juice? Being you is not as simple as
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