A flashback is an interjected scene that takes the narrative back in time from the current point in the story. Flashbacks are often used to recount events that happened before the story's primary sequence of events to fill in crucial backstory. In the opposite direction, a flashforward (or prolepsis) reveals events that will occur in the future. Both flashback and flashforward are used to cohere a story, develop a character, or add structure to the narrative. In literature, internal analepsis is a flashback to an earlier point in the narrative; external analepsis is a flashback to a time before the narrative started.
In movies and television, several camera techniques and special effects have evolved to alert the viewer that the action shown is a flashback or flashforward; for example, the edges of the picture may be deliberately blurred, photography may be jarring or choppy, or unusual coloration or sepia tone, or monochrome when most of the story is in full color, may be used.
An early example of analepsis is in the Ramayana and Mahabharata, where the main story is narrated through a frame story set at a later time. Another ancient example occurs in the Odyssey, in which the main action is told in flashback by Odysseus to a listener.
Another early use of this device in a murder mystery was in "The Three Apples", an Arabian Nights tale. The story begins with the discovery of a young woman's dead body. After the murderer later reveals himself, he narrates his reasons for the murder in a series of flashbacks leading up to the discovery of her dead body at the beginning of the story. Flashbacks are also employed in several other Arabian Nights tales such as "Sinbad the Sailor" and "The City of Brass".
Analepsis was used extensively by author Ford Madox Ford, and by poet, author, historian and mythologist Robert Graves.
The 1927 book The Bridge of San Luis Rey by Thornton Wilder is the progenitor of the modern disaster epic in literature and film-making, where a single disaster intertwines the victims, whose lives are then explored by means of flashbacks of events leading up to the disaster.
Analepsis is also used in Night by Elie Wiesel.
If flashbacks are extensive and in chronological order, one can say that these form the present of the story, while the rest of the story consists of flash forwards. If flashbacks are presented in non-chronological order, the time at which the story takes place can be ambiguous: An example of such an occurrence is in Slaughterhouse-Five where the narrative jumps back and forth in time, so there is no actual present time line.
The Harry Potter series employs a magical device called a Pensieve, which changes the nature of flashbacks from a mere narrative device to an event directly experienced by the characters, which are thus able to provide commentary.
Os Lusíadas is a story about voyage of Vasco da Gama to India and back. The narration starts when they were arriving Africa but it quickly flashes back to the beginning of the story which is when they were leaving Portugal.
The creator of the flashback technique in cinema was D.W. Griffith.
Flashbacks were first employed during the sound era in Rouben Mamoulian's 1931 film City Streets, but were rare until about 1939 when, in William Wyler's Wuthering Heights as in Emily Brontë's original novel, the housekeeper Ellen narrates the main story to overnight visitor Mr. Lockwood, who has witnessed Heathcliff's frantic pursuit of what is apparently a ghost. More famously, also in 1939, Marcel Carne's movie Le jour se lève is told almost entirely through flashback: the story starts with the murder of a man in a hotel. While the murderer, played by Jean Gabin, is surrounded by the police, several flashbacks tell the story of why he killed the man at the beginning of the movie.
One of the most famous examples of a flashback is in the Orson Welles' film Citizen Kane (1941). The protagonist, Charles Foster Kane, dies at the beginning, uttering the word Rosebud. The remainder of the film is framed by a reporter's interviewing Kane's friends and associates, in a futile effort to discover what the word meant to Kane. As the interviews proceed, pieces of Kane's life unfold in flashback, but n. Welles' use of such unconventional flashbacks was thought to have been influenced by William K. Howard's The Power and the Glory.
Though usually used to clarify plot or backstory, flashbacks can also act as an unreliable narrator. Alfred Hitchcock's Stage Fright from 1950 notoriously featured a flashback that did not tell the truth but dramatized a lie from a witness. The multiple and contradictory staged reconstructions of a crime in Errol Morris's 1988 documentary The Thin Blue Line are presented as flashbacks based on divergent testimony. Akira Kurosawa's 1950 Rashomon does this in the most celebrated fictional use of contested multiple testimonies.
Sometimes a flashback is inserted into a film even though there was none in the original source from which the film was adapted. The 1956 film version of Rodgers and Hammerstein's stage musical Carousel used a flashback device which somewhat takes the impact away from a very dramatic plot development later in the film. This was done because the plot of Carousel was then considered unusually strong for a film musical. In film version of Camelot (1967), according to Alan Jay Lerner, a flashback was added not to soften the blow of a later plot development but because the stage show had been criticized for shifting too abruptly in tone from near-comedy to tragedy.
A good example of both flashback and flashforward is the first scene of La jetée (1962). As we learn a few minutes later, what we are seeing in that scene is a flashback to the past, since the present of the film's diegesis is a time directly following World War III. However, as we learn at the very end of the film, that scene also doubles as a prolepsis, since the dying man the boy is seeing is, in fact, himself. In other words, he is proleptically seeing his own death. We thus have an analepsis and prolepsis in the very same scene.
Occasionally, a story may contain a flashback within a flashback, with the earliest known example appearing in Jacques Feyder's L'Atlantide. In John Ford's The Man Who Shot Liberty Valance (1962), the main action of the film is told in flashback, with the scene of Liberty Valance's murder occurring as a flashback within that flashback. Other examples that contains flashbacks within flashbacks are the 1968 Japanese film Lone Wolf Isazo and 2004's The Phantom of the Opera, where almost the entire film (set in 1870) is told as a flashback from 1919 (in black-and-white) and contains other flashbacks; for example, Madame Giry rescuing the Phantom from a freak show. An extremely convoluted story may contain flashbacks within flashbacks within flashbacks, as in Six Degrees of Separation, Passage to Marseille, and The Locket. This technique is a hallmark of Kannada movie director Upendra whose futuristic flick Super (2010) is set in 2030 and contains multiple flashbacks ranging from 2010 to 2015 depicting a utopian India.
Satyajit Ray experimented with flashbacks in The Adversary (Pratidwandi, 1972), pioneering the technique of photo-negative flashbacks.
The television series Quantico (TV series), Kung Fu, Psych, How I Met Your Mother, Grounded for Life and I Didn't Do It use flashbacks in every episode. Flashbacks were also a predominant feature of the television show Lost. Many detective shows routinely use flashback in the last act to reveal the culprit's plot: eg, Murder, She Wrote, Banacek, Columbo.