Manipulating light can induce psychedelic experiences – and scientists aren't quite sure why

By Matthew MacKisack, Associate Research Fellow, University of Exeter
Reshanne Reeder, Senior Lecturer in Psychology, Edge Hill University

For millennia, people have used mind-altering techniques to achieve different states of consciousness, envision spiritual figures, connect with nature, or simply for the fun of it. Psychedelic substances, in particular, have a long and controversial history. But for just as long, people have been having these experiences without drugs too, using rhythmic techniques such as rocking, chanting or drumming.

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