This heat map of brain activity patterns shows profound disturbance during an individual’s experience after taking psilocybin. Relatively stable patterns before and after the dose (blue and green hues) are temporarily scrambled during the "trip" (red, orange and yellow hues). Researchers at Washington University School of Medicine in St. Louis report that psilocybin destabilizes a critical network of brain areas involved in introspective thinking. The findings provide a neurobiological explanation for the drug’s mind-bending effects.