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flashback (n.)

also flash-back, 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.

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Definitions of flashback from WordNet

flashback (n.)
a transition (in literary or theatrical works or films) to an earlier event or scene that interrupts the normal chronological development of the story;
flashback (n.)
an unexpected but vivid recurrence of a past experience (especially a recurrence of the effects of an hallucinogenic drug taken much earlier);
From wordnet.princeton.edu