Overview
- The Nature Medicine study reports that psilocybin, LSD, mescaline, DMT, and ayahuasca share a two-part pattern with weaker within-network links and stronger cross-talk between thinking and sensory systems.
- Researchers combined 11 resting-state fMRI datasets from five countries, reprocessed the scans with one pipeline, and used Bayesian hierarchical models to estimate effect size and certainty.
- The analysis highlights stronger coupling between cortical association networks and sensorimotor circuits, with the caudate and putamen showing the clearest increases and other deep-brain findings varying by drug.
- Effects were most consistent for LSD and psilocybin, mescaline showed similar but more variable patterns, and DMT and ayahuasca carried wider uncertainty because their samples were small.
- Experts caution that fMRI tracks blood flow rather than neurons, so some signals could be vascular, and the authors position the map as a benchmark that still needs larger, task-based and longitudinal studies before shaping care or policy.