bioRxiv preprint doi: https://doi.org/10.1101/2020.05.01.072314; this version posted April 14, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. Serotonergic psychedelic drugs LSD and psilocybin reduce the hierarchical differentiation of unimodal and transmodal cortex Manesh Girna, Leor Rosemanb, Boris Bernhardta, Jonathan Smallwoodc, Robin Carhart-Harrisb, R. Nathan Sprenga,d,e,f a Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC, Canada. b Centre for Psychedelic Research, Department of Brain Sciences, Imperial College London, London, UK c Department of Psychology, University of York, York, UK d Departments of Psychiatry and Psychology, McGill University, Montreal, QC, Canada e Douglas Mental Health University Institute, Verdun, QC, Canada f McConnell Brain Imaging Centre, McGill University, Montreal, QC, Canada 1To whom correspondence should be addressed. Correspondence:
[email protected] Laboratory of Brain and Cognition Montreal Neurological Institute and Hospital 3801 Rue Université, Montréal, QC H3A 2B4 Conflicts of interest: none 1 bioRxiv preprint doi: https://doi.org/10.1101/2020.05.01.072314; this version posted April 14, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. Abstract LSD and psilocybin are serotonergic psychedelic compounds with potential in the treatment of mental health disorders.