Human Cortical Serotonin 2A Receptor Occupancy by Psilocybin Measured Using [11C]MDL 100,907 Dynamic PET and a Resting-State fMRI-Based Brain Parcellation
Frontiers in Neuroergonomics January 20, 2022 Yun Zhou, Frederick S. Barrett, Theresa M. Carbonaro et al. 17 citations
A psychoactive dose of psilocybin (10 mg/70 kg) occupied an average of 39.5% of serotonin 2A receptors in the brains of four healthy volunteers, as measured by PET imaging. The highest occupancy occurred in regions of the default mode network, including the subgenual anterior cingulate and bilateral angular gyri, with values between 63.12% and 74.72%. Individual variability in regional occupancy was marked. These findings support further research into how differences in receptor occupancy relate to psilocybin's acute and lasting effects.