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. Author manuscript; available in PMC: 2019 Aug 23.
Published in final edited form as: Curr Top Behav Neurosci. 2018;36:393–430. doi: 10.1007/7854_2017_474

Figure 3.

Figure 3.

Follow-up ratings of spiritual experience and positive behavior change as a function of psilocybin dose. “Dose Effects Study” data (5 pairs of bars at the left) show the dose-related effect of psilocybin on retrospective ratings assessed 1 month after sessions (Griffiths et al., 2011). “3 studies” observations (bars at the right) show retrospective ratings assessed 3 to 8 weeks after the first high-dose (30 mg/70 kg) session administered in each of 3 studies (Griffiths et. al. 2006, 2011, unpublished study in beginning meditators). Dark bars show the percentage of volunteers who rated their session as within the top five or single most spiritual experience of their life. Lighter bars show the percentage of volunteers who rated a moderate or greater degree of positive behavior change at follow-up.