A bioRxiv preprint reports that classic psychedelics (LSD, psilocybin and mescaline) increased the number of "gateway" regions in the brain's frontoparietal control and dorsal attention networks, while MDMA and amphetamine did not follow the same pattern. The authors reanalysed resting-state fMRI scans from two Basel crossover studies using integrated information decomposition, which separates information shared across brain regions from information that emerges only when