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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 2.

Figure 2.

Measures of mystical experience on session days 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 two measures of mystical experience (Griffiths et al 2011). “3 studies” observations (bars at the right) show post-session ratings from 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 al. 2006, 2011, unpublished study in beginning meditators).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 met criteria for having a complete mystical experience. Lighter bars show the mean Mystical Experience Questionnaire total score expressed as a percentage of maximum possible score; brackets show ± 1 S.E.M. Categorizations of complete mystical experiences and calculations of total scores were based on the 30-item Mystical Experience Questionnaire (MEQ30).