Using simultaneous PET–MRI in healthy volunteers, this first integrated molecular and functional neuroimaging study quantifies LSD occupancy at cerebral serotonin 2A receptors and establishes a dose–occupancy relationship while revealing an anticlockwise hysteresis between plasma levels and subjective effects. LSD produced distinct haemodynamic and functional changes — increasing global cerebral and internal carotid artery flow without altering artery diameter and reducing global connectivity (GCOR), with GCOR changes negatively correlated with CBF and differing from effects of psilocybin — findings relevant to clinical development.
- Published
- Journal
- MedRvix
- Authors
- Andersen, T. L., Falck, N., Fisher, P. M., Geisler, M., Holze, F., Jensen, P. S., Johansen, A., Johansen, S. S., Knudsen, G. M., Larsen, K., McCulloch, D. E-W., Neufeld, V., Nielsen, M. K. K., Nykjær, C. H., Randrup, P. P., Reveles Jensen, K. H., Shulganov, V., Skov-Andersen, P., Spanggård, A., Steenstrup, E., Stenbæk, D. S., Svarer, C.