- For additional meanings of "Flashback", please see 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. (VOY: "The Raven")
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. (VOY: "Flashback")