is a neuroscientist at the University of California in Berkeley. His areas of expertise include the chemistry of the human nervous system, the effects of drugs on the brain and mind, and the scientific study of mind and consciousness.
Psychedelics are among the most interesting and poorly understood of all the psychoactive substances. They produce a variety of complex effects on the brain and mind, including intensification of thoughts and feelings, alterations of sensory perception, and loosening of psychological defenses. Because of these complex effects, psychedelics are powerful probes of the connection between brain physiology and consciousness, one of the most deeply mysterious questions in contemporary science.