# Psychedelics reveal hidden brain order > Brain scans show psychedelics create order beneath chaos, not random breakdown. - Title: Psychedelics reveal hidden brain order · Ars Technica - Summary: Brain scans show psychedelics create order beneath chaos, not random breakdown. Psilocybin reduces brain network boundaries, creating temporary unity between… - Keywords: psilocybin, brain networks, default mode network, visual network, embeddedness, neuroscience, mri, ai analysis, psychological changes, neuroscience study, technology, science - Source: Ars Technica — https://arstechnica.com/science/2026/10/the-psychedelic-brain-looks-like-chaos-underneath-theres-order - Published: 2026-10-10T11:15:35+00:00 - Read time: 1 min - Topics: psilocybin, brain networks, default mode network, visual network, embeddedness, neuroscience, mri, ai analysis, psychological changes, neuroscience study, technology, science ## Brain chaos myth For about a decade, mainstream science believed psychedelics caused brain chaos by breaking neural highways. > Think of the networks of the brain as highways ## PsiConnect study Stoliker’s team scanned 62 first-time psilocybin users with MRI and EEG to measure brain activity during four contexts. > We wanted ecological validity ## Meaningful experiences Half the participants ranked their session as life-changing, with 24 placing it in their personal top five. > Half of the participants ranked their session among the most meaningful experiences of their lives ## Blurred boundaries Under psilocybin, sensory regions lost dominance while associative regions gained, reducing internal-external world separation. > It seems like the brain’s ability to construct reality, or imagination, or our associations, our beliefs, our sense of self, these faculties had more dominance over sensory areas ## Network reorganization Brain network connections weakened internally while between-network connections strengthened, reducing modularity by 85 percent. > The gap between eyes-open and eyes-closed connectivity shrank by 85 percent ## Hidden order Researchers used AI to find ordered structures in brain activity that standard averaging methods miss. > The problem with this analysis is that it runs the risk of missing ordered structures that appear for a brief period and then disappear into chaos ## Context matters Brain activity clusters separated into four distinct groups: rest, meditation, music, and eyes-open video. > The trajectories separated into four distinct clusters corresponding to rest, meditation, music, and the movie ## Embeddedness The default mode network and visual network each contributed over 20 percent to reduced self-external world separation. > The default mode network is strongly associated with the sense of self: daydreaming, mind wandering, thinking about yourself ## Psychological shifts Participants reported positive psychological changes the next day, with scores ranging from, 100 to 100. > For the vast majority of our participants, we found they had positive psychological changes the next day ## Therapeutic potential Stoliker suggests tuning context variables like music or visuals could improve psychedelic therapy outcomes. > If context isn’t just mood-setting but is mechanically shaping brain organization, Stolkier argues, then the room, the playlist, and the instructions start to look like clinical variables ## Future challenges Researchers note individual differences in subjective experiences despite identical embeddedness scores and healthy participant limitations. > As of now, the researchers admit that when two people report identical “embeddedness” scores, they can potentially have very different subjective experiences ## Key takeaway Psilocybin reduces brain network boundaries, creating temporary unity between internal and external worlds.