Flashbacks are not confined to psychedelic
states. Any highly traumatic
experiences may cause the subject to ocassionally experience a very vivid recollection of the moment, with emotion
s and sensory
memories so vivid that it feels like they're back in it. Flashbacks are a primary symptom of PTSD
(post-traumatic stress disorder), a common affliction among rape victims, disaster survivors, and battlefield veterans.
It seems likely that flashbacks can also occur to states of ecstasy
, although psychology has long shown a bias towards pathology
, meaning that these have been less-studied.