The ego, faced with the prospect of its own extinction, turns inward and becomes hypervigilant, withdrawing its investment in the world and other people. The cancer patients I interviewed spoke of feeling closed off from loved ones, from the world, and from the full range of emotions; they felt, as one put it, “existentially alone.” By temporarily disabling the ego, psilocybin seems to open a new field of psychological possibility, symbolized by the death and rebirth reported by many of the patients I interviewed. At first, the falling away of the self feels threatening, but if one can let go
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