How Psilocybin Works in the Brain
Psilocybin, the psychoactive compound found in "magic mushrooms," works primarily on the brain's serotonin system, especially the 5-HT2A receptor. By binding to this receptor, psilocybin alters patterns of neural activity and connectivity, producing profound changes in perception, mood, and sense of self.
Neuroimaging studies have shown that psilocybin reduces activity in the default mode network (DMN)—a brain system associated with self-referential thinking, rumination, and rigid patterns of thought. When the DMN quiets down, communication between normally segregated brain regions increases.
This "reset" effect is thought to underlie the loosening of entrenched mental patterns, offering therapeutic potential for conditions such as depression and anxiety, PTSD in veterans, and addiction.
