Psychedelics align brain activity with context

Psilocybin changed how the brain responded to different contexts, including meditation, music and film, with stronger context-related brain changes linked to changes in self-perception and mindset.

This study used fMRI and EEG in 62 psychedelic-naïve adults to examine how psilocybin affects brain activity across different contexts, including meditation, music and film.

Psilocybin reduced the segregation between brain networks while increasing integration in associative regions, but the key finding was that brain activity became more structured and aligned with the context participants were experiencing, rather than simply becoming disordered. Greater context alignment was associated with stronger experiences of self- and boundary-dissolution—a sense of being less separate from the surrounding environment—and with greater next-day changes in mindset.

The findings suggest that the way psilocybin reorganises brain dynamics is closely linked to both the subjective experience and the surrounding context, although the study does not establish that these brain changes cause subsequent psychological change.

Abstract

Psychedelics can profoundly alter consciousness by reorganizing brain connectivity1,2, producing acute experiences that shape lasting psychological change3,4. Psychedelic dynamics are commonly described as desynchronized or entropically disordered5,6, yet the brain organization underlying self-dissolving and boundary-dissolving experiences that participants often report7, and how context shapes that organization8, remain unresolved. To address this, we acquired the largest single-site psychedelic neuroimaging dataset to date. Sixty-two adults underwent functional magnetic resonance imaging (fMRI) and electroencephalography (EEG) during rest and naturalistic stimuli (meditation, music and movie), before and on the day of psilocybin administration (fMRI ~ 80 min post-dose; EEG ~ 150 min post-dose).

Half ranked the experience among the most meaningful of their lives7. Here, using machine learning to represent the brain dynamics of each individual as low-dimensional trajectories, we show that psilocybin reorganizes brain activity into structured, context-sensitive patterns that co-vary with the quality of subjective experience, revealing a latent order missed by time-averaged measures. Networks that ordinarily segregate internal and external processing integrated, producing cohesive context-aligned trajectories in participants reporting the felt experience of being continuous with, rather than separate from, the environment, a state we refer to as embeddedness.

The strength of this context alignment scaled with both the depth of self-dissolving and boundary-dissolving experience and the next-day mindset change. Our findings recast apparent disorder as latent organization aligned with context, linking neurobiology to subjective experience and behavioural change.

Stoliker, D., Novelli, L., Khajehnejad, M. et al. Psychedelics align brain activity with context. Nature 656, 936–947 (2026). Read Paper

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