Many researchers acknowledge that a strong placebo effect may be at work when a drug as suggestible as psilocybin is administered by medical professionals with legal and institutional sanction: under such conditions, the expectations of the therapist are much more likely to be fulfilled by the patient. (And bad trips are much less likely to occur.) Here we bump into one of the richer paradoxes of the psilocybin trials: while it succeeds in no small part because it has the sanction and authority of science, its effectiveness seems to depend on a mystical experience that leaves people convinced
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