Secular Mysticism: Where Science and Religion Meet in Psychedelic Medicine

A summary of Aidan Seale-Feldman's recent article on the entanglements of science and religion in psychedelic medicine.

Something strange is happening at the heart of modern psychiatry. Clinical trials of psilocybin, MDMA, and ayahuasca are showing genuine promise for treating depression, PTSD, anxiety, and addiction — and yet the variable that most reliably predicts whether the therapy works is not pharmacological at all. It's the presence of a "mystical experience": a sense of unity, ego dissolution, sacredness, and a noetic feeling of having touched something more real than ordinary reality.

In her article, medical anthropologist Aidan Seale-Feldman (University of Notre Dame) examines what this strange correlation means for a field that has, since its founding, defined itself as resolutely secular. Drawing on ethnographic fieldwork in U.S. clinical trials, ketamine clinics, and the new wave of "psychedelic churches," she argues that psychedelic medicine is forcing a reckoning between two worldviews that twentieth-century psychiatry tried hard to keep apart: empirical biomedicine and lived spirituality.

The paradox at the center

For psilocybin in particular, therapeutic efficacy is statistically tied to the quality of the mystical experience occasioned during dosing sessions — measured by instruments like the Mystical Experience Questionnaire, itself adapted from mid-twentieth-century theological research on William James and W.T. Stace. Researchers have a measurable, replicable phenomenon in which encounters traditionally described as "religious" produce durable mental health benefits. But what does it mean for a secular clinical science to depend on something it cannot, by its own framework, name?

"Secular mysticism" as an emerging category

Seale-Feldman traces how participants — many of them religiously unaffiliated Americans, the so-called "nones" — narrate experiences of the divine, of cosmic interconnection, or of communion with the dead, and then carry those experiences back into ordinary, secular lives. Some integrate them through the language of therapy and neuroscience. Others find that clinical framing falls short, and gravitate toward emerging psychedelic churches, ayahuasca communities, or syncretic practices that blur clinical and ceremonial registers.

Her ethnographic vignettes are striking: a person raised in what they called a "spiritual desert" who, during a routine ketamine infusion with no therapeutic preparation, undergoes a full-blown mystical experience that reorganizes their ethical life. Such cases sit uncomfortably in the categories psychiatry has available.

Why this matters for the field

The article suggests that psychedelic medicine is doing something more than expanding the pharmacopeia. It is reopening questions that secular psychiatry largely closed in the twentieth century: about the reality and meaning of religious experience, about whether healing requires a framework of significance that biomedicine cannot supply on its own, and about how a scientific field metabolizes a phenomenon — the mystical — that it inherited from theology and never fully stripped of its origins.

Seale-Feldman frames this as an "entanglement" rather than a synthesis. Science and religion in psychedelic medicine are not merging into a tidy whole; they are producing friction, hybrid practices, and new cultural forms — including a genuinely novel category she calls secular mysticism, in which spiritual experience is taken seriously as transformative without requiring traditional religious commitments.

The bigger picture

For readers interested in resonance between scientific and contemplative ways of knowing, the article is a careful, sympathetic look at a field where that resonance is no longer hypothetical — it's encoded in the very outcome measures of FDA-track clinical trials. Whether psychiatry will be transformed by what it has invited in, or whether mystical experience will be quietly reabsorbed into the language of "neural correlates" and "default mode network suppression," remains an open question. Seale-Feldman's work is among the most thoughtful guides we have to watching it unfold.

Reference: Seale-Feldman, A. Secular Mysticism: Entanglements of Science and Religion in Psychedelic Medicine. PMID: 42050063. PubMed link