Scientists at Washington University in St. Louis have identified the precise mechanism by which psilocybin, the active compound in so-called magic mushrooms, alters brain function, according to a neurological study published in the journal Nature.
The research found that psilocybin does not simply trigger random chaos in the brain. Instead, the study said the compound massively desynchronizes established brain networks, allowing them to reorganize in a more flexible way. The finding gives a biological explanation for the therapeutic effects the substance has shown on the mind.
Default mode network disruption and brain plasticity
Brain scans used in the study showed that the Default Mode Network, the set of regions active when the mind is at rest and not focused on a specific task, temporarily lost its usual connectivity. As the rigid connections broke down, brain regions that normally do not interact began communicating with one another, according to the research.
The researchers described this disorganization as acting like a reset of the nervous system, one that favors mental plasticity, the brain's ability to form new connections and adapt.
To track this reconfiguration, the research team monitored brain activity using continuous functional magnetic resonance imaging. The data showed that although the acute perceptual effects of psilocybin fade within a few hours, the brain maintains a prolonged state of high cognitive malleability that facilitates neural restructuring afterward.
New hope for treating depression and anxiety
Understanding this reordering process opens the door to consolidating innovative clinical approaches, according to the study. Psilocybin has drawn growing scientific interest as a possible treatment for treatment-resistant depression, a form of the illness that does not respond to standard antidepressants.
The analysis noted that any clinical benefit requires professional supervision to help integrate the changes the drug produces in the brain. The researchers said this combination, controlled therapeutic settings paired with the drug's mechanism of action, is key to developing more precise treatments for complex psychiatric conditions.
Nature, the journal that published the findings, is one of the world's leading peer-reviewed scientific publications. Washington University in St. Louis, which led the research, is a major U.S. research university with an established neuroscience program.
Psilocybin is a naturally occurring psychedelic compound found in certain species of mushrooms. It has been studied in recent years for potential use alongside psychotherapy in treating depression, anxiety and other mental health conditions, though it remains a controlled substance in most countries outside of approved clinical trials.
