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For the first time, scientists have scanned the brains of volunteers as they used LSD. In a series of experiments, the volunteers were injected with the Class A drug while they underwent a brain scan. The scientists found the drug broke down barriers between parts of the brain which usually control separate functions like vision, hearing and movement. We hear from one of the volunteers - Josh Hulbert - about why he took part and what happened.

PHOTO: Josh Hulbert. CREDIT: Screenshot from Georgina Cammalleri’s film about the experiment -‘The Acid Tapes’.