The Effects of Psilocybin in Healthy Volunteers: Psychological, Biochemical and Electrophysiological Biomarkers.

In this study, participants will received either psilocybin (the active ingredient found in certain mushrooms) or an inactive placebo (a look-alike tablet with no active drug). The psilocybin is supplied by Filament Health (Burnaby, British Columbia). After psilocybin ingestion, the body quickly converts it into psilocin, which is the form that produces the temporary psychological effects. Psilocin mainly works by interacting with serotonin receptors in the brain, especially a type called the 5-HT2A receptor. This study will be done in healthy volunteers using a single oral dose of 25 mg (one tablet by mouth), consistent with doses used in previous clinical research. The goal is to understand the biological, psychological, and high-density EEG (hd-EEG) changes that can happen after a one-time dose of psilocybin.