Researchers tested whether psilocybin mushrooms could help treat obsessive-compulsive disorder (OCD) using mice. They found that psilocybin reduced compulsive burying behavior in mice, similar to how approved OCD medications work. The study revealed that this anti-compulsive effect works through different brain mechanisms than previously thought, and that combining psilocybin with another drug called buspirone might block psychedelic effects while keeping therapeutic benefits.