Strassman has also conducted similar research using psilocybin, a psychedelic alkaloid found in hallucinogenic mushrooms. Micropsia can result from the action of mescaline and other hallucinogenic drugs. This is most common among stoner doom bands, who often describe hallucinogenic or psychedelic experiences. These were entheogenic preparations used in European witchcraft for their mind-altering and hallucinogenic effects. He underwent a treatment using ibogaine, a potent hallucinogenic drug. Ketamine is also used as a recreational drug for its hallucinogenic and dissociative effects. Scopolamine induces respiratory depression at hallucinogenic doses. Some stimulants, specifically those with empathogenic and hallucinogenic effects, also affect serotonergic transmission. Other magnoliids also are known for their narcotic, hallucinogenic, or paralytic properties. Psilocin is the chemical primarily responsible for the hallucinogenic effects of the "Psilocybe". Levine used hallucinogenic drugs in his adolescence. Many patients at Newhaven were treated with the hallucinogenic drug LSD. This form of trance could have been induced partly due to ingestion of hallucinogenic mushrooms. Elsewhere, LSD is better known as the initials of the name of a hallucinogenic drug. It appears that DMT can produce a hallucinogenic experience.