News,
The largest single-site psychedelic neuroimaging study to date finds that psilocybin doesn’t simply disorder the brain’s activity. Under the drug, brain dynamics became more structured, not less, and the strength of that structure tracked how intense and meaningful participants found the experience. The apparent “chaos” reported by earlier studies may be an artefact of how the data was analysed.
Sixty-two healthy adults with no prior psychedelic experience underwent fMRI and EEG brain scanning in four different situations: resting, guided meditation, listening to music, and watching a movie. Each person was scanned once sober, and once after taking 19 mg of psilocybin.
Under psilocybin, communication between sensory areas, like the visual cortex, and the rest of the brain was reduced, while associative “thinking” areas communicated more with the wider brain. One striking finding was that the brain’s connectivity patterns looked nearly the same whether the participants’ eyes were open or closed, almost as if the brain stopped caring about visual input. Perhaps reflecting the experience of visual hallucinations.
The researchers then used machine learning to visualise the brain’s activity patterns as a moving three-dimensional trajectory. The stronger the psychedelic experience a participant reported, the more cleanly these trajectories aligned into distinct patterns. Stronger experiences meant tighter clustering of the activity; psilocybin seems to create structure rather than randomness.
Under psilocybin influence, theta, alpha and beta power dropped with eyes closed, and the difference between eyes-open and eyes-closed alpha waves shrank by 48%. Alpha waves normally appear when the eyes are shut, as we discussed in our previous brain waves article. The brain simply stopped treating eyes-open and eyes-closed as different states.
So what makes this paper different? Carhart-Harris’s “entropic brain” theory [1], the idea that psychedelics push the brain into a more random, less organised mode, and a landmark Nature paper on psilocybin desynchronization [2] frame the psychedelic brain as disordered. According to this new paper, that apparent disorder is an artefact of the standard analysis method: averaging the brain’s activity over time erases the hidden dynamics underneath. Those dynamics are quiet and beautifully ordered. That order follows the person’s experience.
Another notable outcome was that half of the participants ranked the experience among the most meaningful of their lives. The field has long debated whether the subjective experience matters for therapeutic effects, and this paper adds to that debate. This study however only uses healthy adults and a single fixed dose, and the brain-experience links are correlations, not causes.
If context alignment predicts mindset change, then “set and setting” becomes measurable neuroscience rather than folklore, with direct implications for clinical psychedelic therapy according to the authors. They also suggest that these embedding methods could apply to consciousness research and psychiatry more broadly.
Disclaimer: This article discusses scientific research on psilocybin for informational purposes only. Nothing here constitutes medical advice or a recommendation to use psychedelic substances. Psilocybin remains a controlled substance in many jurisdictions, and its use outside approved clinical research settings is illegal in most countries. The study described was conducted under strict medical supervision with ethics approval and safety protocols. Psychedelic substances can pose serious psychological risks, particularly for individuals with personal or family history of psychosis, and should never be used without professional oversight. If you are struggling with mental health, consult a qualified healthcare provider.
Declaration of AI use: This article was written with the assistance of Lumo AI for grammar, spell checking, and proofreading.
Reference
Stoliker, D., Novelli, L., Khajehnejad, M., Biabani, M., Greaves, M.D., Barta, T., Williams, M., Chopra, S., Bazin, O., Simonsson, O., Chambers, R., Barrett, F.S., Deco, G., Preller, K.H., Carhart-Harris, R.L., Seth, A.K., Sundram, S., Egan, G.F. and Razi, A. (2026) ‘Psychedelics align brain activity with context’, Nature, 656, pp. 936–947. doi: 10.1038/s41586-026-10910-z.
[1] Carhart-Harris, R.L. (2018) ‘The entropic brain – revisited’, Neuropharmacology, 142, pp. 167-178. doi: 10.1016/j.neuropharm.2018.03.010.
[2] Siegel, J.S. et al. (2024) ‘Psilocybin desynchronizes the human brain’, Nature, 632, pp. 131-138. doi: 10.1038/s41586-024-07624-5.
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