An international brain imaging analysis finds psychedelics reorganize cortical connectivity, increasing global integration while reducing localized network segregation

Psychedelics reshape large-scale brain communication by increasing global connectivity across cortical networks while weakening the tight local organization that normally keeps systems more segregated. Brain imaging data indicate a shift toward a more integrated and flexible mode of information flow that may help explain altered perception, cognition, and self-experience during psychedelic states. The analysis combines international neuroimaging datasets to identify a common connectivity signature across different psychedelic compounds. That pattern appears across the cerebral cortex rather than in one isolated region, suggesting that broad network-level reorganization is a central feature of psychedelic action. These findings matter because cortical integration and segregation are linked to consciousness, mental flexibility, and psychiatric symptoms. A clearer map of how psychedelics rewire neural communication could support mechanistic models of their acute effects and inform therapeutic research in disorders marked by rigid or maladaptive brain network dynamics.