Flashback

A flashback was a recurrent memory in which a person had a sudden re-experiencing of a past experience. Flashbacks could be caused by a medical condition known as hypnagogic regression or simply a traumatic experience. 

Nog suffered several flashbacks involving losing his leg in a Jem'Hadar attack on AR-558. 

Lt. Commander Tuvok suffered flashbacks to a false memory created by a virus masquerading as a repressed memory engram. A mind meld with Captain Janeway resulted in a flashback to the time Tuvok served on the USS Excelsior under Captain Hikaru Sulu. The virus that infected him was transmitted to him then by science officer Dmitri Valtane. 

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Flashback (roman)