There are likely a number of religious-studies scholars who would cringe and groan at Roland Griffiths’s studies of drug-induced mystical experience. I haven’t gone into their literature in a while, but I think it would be easy for them to say Griffiths is setting the study of mysticism back many decades. Because Griffiths’s stated conception of mystical experience is one that many religionists would already have considered very dated – even when I was studying them twenty years ago.

I say this because Griffiths’s first groundbreaking study, in indicating that many psilocybin volunteers had mystical experiences, measures mystical experience using a questionnaire based on W.T. Stace‘s Mysticism and Philosophy, published in 1960. And when I was in grad school twenty years ago, Stace’s work was often considered impossibly backward.