Psychedelic experience sources of some psychedelic drugs such as ayahuasca and mescaline-containing cacti are sometimes referred to as "plant teachers". Similarly, in a follow-up to the psilocybin and mysticism study at Johns Hopkins, researchers observed that psilocybin: "occasions personally and spiritually significant mystical experiences that predict long-term changes in behaviors, attitudes and values". Psychedelic experience includes the full range of mystical or religious experiential phenomena. Two scientific studies have concluded that psilocybin (a typical psychedelic compound that occurs naturally in psilocybin mushrooms) reliably triggers mystical-type experiences. The more recent study at Johns Hopkins University identified mystical experiences by means of several questionnaires
Hallucinogenic plants in Chinese herbals "-gen" "producing"): "A mind-altering chemical, drug, or agent, specifically a chemical the most prominent pharmacologic action of which is on the central nervous system (mescaline); in normal people, it elicits optic or auditory hallucinations, depersonalization, perceptual disturbances, and disturbances of thought processes." Pharmacology divides hallucinogens into three classes. "Psychedelic" (first used in 1956 from Greek "psyche-" "mind; soul" and "delein" "to manifest"): "Pertaining to a rather imprecise category of drugs with mainly central nervous system action, and with effects said to be the expansion or heightening of consciousness, LSD, hashish, mescaline, psilocybin." "Dissociative" is a class of hallucinogen that produces