For the first time ever, scientists have been able to see just what LSD does to the human brain. Though declared off limits for medical use in the Controlled Substances Act of 1970, today scientists are exploring how this drug can actually help those with mental illness. LSD increases the connection between the parts of the brain that control how we perceive our environment and how we perceive ourselves, helping ease the rigid and inflexible thought-patterns common among those with mental illness. But what about the harm? LSD has been off-limits for a reason, after all. This infographic explores what scientists have learned about LSD so far and what it does to your brain.