How does psilocybin work? The science behind magic truffles

After decades of silence — following the psychedelic ban in the 1970s — neuroscientists are systematically studying psilocybin again. What happens in the brain? Why do people report such profound experiences? And what does this mean for our understanding of consciousness?

From psilocybin to psilocin

After ingestion, psilocybin is rapidly converted by the body into psilocin. This compound crosses the blood-brain barrier and binds primarily to 5-HT2A serotonin receptors — especially in the prefrontal cortex, the part of the brain associated with thinking, planning and self-awareness.

The Default Mode Network

One of the most important discoveries concerns the Default Mode Network (DMN). This network is active when we are at rest, daydreaming or thinking about ourselves. The DMN is strongly associated with rumination, self-criticism and fixed thought patterns.

Psilocybin significantly reduces activity in the DMN. Research using fMRI shows that the brain becomes less predictable and more flexible — brain areas that normally never talk to each other suddenly form new connections.

Increased neural entropy

Researchers speak of increased “neural entropy” — more disorder in brain activity. This sounds negative, but in this context it means more flexibility, more openness and less entrenched patterns. It is precisely this that many people experience as liberating: thinking outside the usual tracks.

The therapeutic potential

The neuroscientific findings partly explain the therapeutic potential. Rigid thought patterns — characteristic of depression, OCD and trauma — are disrupted by psilocybin. This creates space for new perspectives, new ways of relating to painful experiences.

Research at Johns Hopkins, Imperial College London and UCSF shows that even a single high dose can have lasting effects on psychological flexibility, emotional wellbeing and quality of life.

The role of the set and setting

Brain scans alone do not explain the experience. The quality of the experience is strongly influenced by set (your intention, expectations and mental state) and setting (the environment, guide and music). The neurobiology provides the window; what you do with it depends on preparation, guidance and integration.