A person with naturally occurring synesthesia experiences the sensory world in overlapping layers. Sounds are seen as colors and tastes are processed as sounds. Overall, there are 60 documented forms ...

In the spring of 1966, Stewart Brand did 100 micrograms of LSD and sat on top of a roof in San Francisco. Perched there, he looked toward a curved horizon and imagined the spherical Earth and just how ...

This image shows how much more of the brain contributes to the visual experience under LSD than under placebo. (Credit: Imperial/Beckley Foundation) The psychedelic drug LSD is known for the wild ...