Those who have used psilocybin or LSD may be familiar with the experience: The day following your trip, it’s back to reality, yet there are still glimmers of your previous day’s journey, a fleeting visual cue borrowing from the more intense hallucinogenic effects you just experienced.
These spontaneously recurring, drug-like effects following hallucinogenic exposure are referred to as flashback phenomena; symptoms can include vision changes, mood changes and derealization/depersonalization. Those with persistent recurring flashbacks causing significant distress or impairment may have hallucinogen persisting perception disorder (HPPD), which is considered extremely rare.
New research published in the journal Psychopharmacology further explores
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