FlashBack, as the name implies, is a relapse of the state after taking a hallucinogenic substance over a significant time interval since the intake. Theoretically, flashbacks can occur even weeks or months after the last exposure to the substance.
FlashBack usually manifests itself in a temporary (lasting a few seconds to a few minutes) disturbance of perception, and mild hallucinations may occur. However, the most common symptom is the sensation of moving objects or surfaces that remain motionless. Another common symptom is a sharpening of colors and the comprehension of colors as luminescent (more luminous) than usual.
It's hard to clearly identify the triggers of flashback, however, according to studies conducted so far, one can observe an increased frequency of this phenomenon in stressful situations, during increased relaxation, before falling asleep or after taking other stimulants such as marijuana.
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