S: DrugWise – https://www.drugwise.org.uk/flashbacks/ (last access: 25 April 2020); Medscape – https://emedicine.medscape.com/article/288154-overview (last access: 25 April 2020).
N: 1. 1903 in reference to fires in engines or furnaces, from verbal phrase (1902), from flash (v.) + back (adv.). Movie plot device sense is from 1916. The hallucinogenic drug sense is attested in psychological literature from 1970, which means probably hippies were using it a few years before.
2.An involuntary recurrence of some aspect of a hallucinatory experience or perceptual distortion occurring some time after ingestion of the hallucinogen that produced the original effect and without subsequent ingestion of the substance.
3. In posttraumatic stress disorder (q.v.), the sensations resulting from strong emotional sequences acting as triggers.
4. Recurrent and abnormally vivid recollection of a traumatic experience, as a battle, sometimes accompanied by hallucinations.
5. posttraumatic stress disorder … Essential symptoms: Flashbacks of a traumatic event … Have you ever experienced flashbacks, when you found yourself reliving some terrible experience over and over again?
6. Phraseology: a flashback to s.o.’s past (e.g. childhood, adolescence); flashback episodes, flashback sequences; disorganizing flashback; to experience a flashback, to suffer from flashbacks.
7. Literature, Art, Film and Theatre: analepsis (literary flashback).
A literary technique that involves interruption of the chronological sequence of events by interjection of events or scenes of earlier occurrence.
A description of an event or scene from an earlier time that interrupts a chronological narrative.
S: 1. OED – https://www.etymonline.com/search?q=flashback (last access: 25 April 2020). 2&3. https://medical-dictionary.thefreedictionary.com/flashback (last access: 25 April 2020). 4 to 6. TERMIUM PLUS – https://www.btb.termiumplus.gc.ca/tpv2alpha/alpha-eng.html?lang=eng&i=1&srchtxt=flashback&index=alt&codom2nd_wet=1#resultrecs (last access: 25 April 2020). 7. MW – https://www.merriam-webster.com/dictionary/analepsis (last access: 26 April 2020).
S: OED – https://www.etymonline.com/search?q=flashback (last access: 25 April 2020)