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Drugs that activate the serotonergic 5-HT2A receptor (e.g. LSD, psilocybin, mescaline) are notorious for causing psychedelic experiences and I would like to know the neurochemical mechanism behind this.

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Not sure if this answers your question satisfactorily but the reason for the psychedelic state is "broadband cortical desynchronization"

http://www.jneurosci.org/content/33/38/15171.short

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