Scientists are working to discover how a single psychedelic trip may cause physical changes in a person’s brain . There has been a growing interest in psychedelics, with President Donald Trump signing an executive order last month directing the Food and Drug Administration to accelerate access to the hallucinogenic drugs that are still illegal under federal law. A new small, exploratory study analyzed nearly 30 people in London who had never taken psychedelics before. Researchers tracked the patients’ brain activity after they took a 25-milligram dose of the psychedelic compound psilocybin, which is the active ingredient in so-called magic mushrooms . One month after taking psilocybin, researchers observed greater cognitive flexibility, psychological insight, and overall well-being among patients, according to the study published in Nature Communications on Tuesday.…