Major Study Finds Hidden Order in the Psychedelic Brain That Challenges What We Thought About Psilocybin

• A major study published in *Nature* found that psilocybin reorganizes brain activity, creating hidden patterns that reflect the participant's current experience. The study used fMRI, EEG, and machine learning to examine 62 adults before and after psilocybin administration. The brain networks became less distinct but reorganized into patterns that aligned with the participants' experiences.

• The study revealed that under psilocybin, the brain's visual and sensory networks showed significant changes. In eyes-closed conditions, connectivity between sensory areas and the wider brain decreased while integration involving associative regions increased. The gap in global functional connectivity between eyes-open and eyes-closed conditions narrowed by 85 percent. EEG measurements also showed a similar convergence, with alpha-band activity decreasing and brain-wide signal complexity increasing.

• The findings suggest that psilocybin does not simply disrupt the brain but reorganizes it in ways that reflect the individual's context. Participants who reported positive experiences showed tighter, more distinguishable brain activity patterns. The effect was strongest in those with experiences involving unity, bliss, and self-dissolution. However, it was weaker in those with purely sensory or hallucinatory effects and largely absent in negative experiences. The study highlights the importance of context in shaping the brain's response to psychedelics.

AI-generated summary of the original article — see the source for the full story.