What happens when meditation intersects with psychedelics?

Deep states of meditation and psychedelic‑induced experiences are often described as similar: intense, transformative, and difficult to put into words. But what truly shapes these experiences and the way they are narrated? To what extent do they depend on the substance, the meditative practice, or the context in which they are lived and interpreted?

To address these questions, a team of researchers led by Milan Scheidegger conducted a randomised controlled trial during an intensive three‑day mindfulness retreat with experienced meditation practitioners. During the retreat, half of the participants received a combination of DMT and harmine, while the other half received a placebo, with meditative practice maintained in both groups. Rather than relying solely on questionnaires, the study used detailed phenomenological interviews, which were analysed using qualitative methods and advanced Natural Language Processing (NLP) techniques.

The results revealed a simultaneously convergent and distinct picture. Participants with and without the psychedelic often used similar language, marked by Buddhist concepts, as well as reflections on attention, acceptance, and impermanence. However, the experiences differed in intensity and focus. In the DMT‑harmine condition, reports focused primarily on perceptual alterations, intense emotions, complex visual imagery, and marked changes in self‑perception. In contrast, in the placebo condition, descriptions were more moderate and oriented toward bodily sensations, emotional regulation, and contextual factors of the retreat itself, such as music and the environment.

By analyzing recurring patterns in the language of the reports, the researchers also identified themes that tend to escape traditional approaches, such as oscillations between control and surrender, emotional integration, and the transient nature of mental states. These findings suggest that such experiences do not depend solely on the substance, but emerge from the interaction between practice, context, expectations, and cultural framing.

The study thus reinforces a central idea in contemporary research: the effects of psychedelics cannot be understood in isolation. Beyond asking “what the drug does to the brain,” it is crucial to understand how experiences are lived, narrated, and integrated by individuals in specific contexts. This study was published in the scientific journal Scientific Reports, in the article Mixed-methods analysis on psychedelic-augmented meditation experiences from a randomized controlled mindfulness retreat, as a part of research project 333/20 - Mindfulness and psychedelics: A neurophenomenological approach to the characterization of acute and sustained response to DMT in experienced meditators, supported by the Bial Foundation.

ABSTRACT

The acute subjective effects (ASEs) of psychedelic substances are assumed to play a critical role for their therapeutic and well-being enhancing benefits. However, recent work voiced critique regarding the validity and adequacy of conventional measures and modalities utilized to study ASEs of psychedelics, and call for data-driven, unbiased, and experience-based research approaches. The emergence of advanced Natural Language Processing techniques as an enabler of data-driven qualitative research holds promise for addressing the current biases and limitations in the investigation of ASEs of psychedelics. In the present study, we employed an NLP-driven, multi-method analytical paradigm to study the subjective experiences of participants in an ecologically valid RCT examining the effect of DMT/harmine on meditative states in experienced meditators using phenomenological interviews. Our analysis showed differences in the thematic landscape and experiential diversity of meditation under placebo and meditation under DMT-harmine while showing overlap in their semantic topographies. The mixed-modal analysis successfully identified a wide range of well-established primary subjective effects while also detecting subtle, patterned regularities in language that traditional hypothesis-driven approaches alone may overlook. It revealed a pronounced use of Buddhist concepts and spiritual jargon to describe and integrate the subjective experience, independent of the experimental condition. Findings suggested shared experiential features between meditative and psychedelic states, a strong drug-context interconnection and potential synergistic effects of meditation and psychedelics. We advocate for using NLP-augmented, data-driven paradigms to deepen the understanding of psychedelic subjectivity and emphasize the importance of extra-pharmacological factors in shaping therapeutic outcomes.