Link: https://slatestarcodex.com/2019/10/21/the-pnse-paper/

I've mentioned this a few times, but it's worth going over in detail. The full title is Clusters Of Individual Experiences Form A Continuum Of Persistent Non-Symbolic Experiences In Adults by Jeffery Martin, with "persistent non-symbolic experience" (PNSE) as a scientific-sounding culturally-neutral code word for "enlightenment". Martin is a Reiki practitioner associated with the "Center for the Study of Non-Symbolic Consciousness", so we're not getting this from the most sober of skeptics, but I still find the project interesting enough to deserve a look.

Martin searched various religious and spiritual groups for people who both self-reported enlightenment and were affiliated with "a community that provided validity to their claims". He says he eventually found 1200 such people who were willing to participate in the study, but that "the data reported here comes primarily from the first 50 participants who sat for in-depth interviews…based on the overall research effort these 50 were felt to be a sufficient sample to represent what has been learned from the larger population". Although Martin says he tried to get as much diversity as possible, the group was mostly white male Americans.

Martin's research was mostly qualitative, based on in-depth interviews, so we're mostly going with his impressions. But his impression was that most people who self-described as enlightened had similar experiences, which could be be plotted on: