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In short, thrillers have evolved from being full of suspense and exciting the audience to disturbing them so they feel uncomfortable. There is a significant increase in the amount of violence and gore shown in thrillers and the topics and themes have become more graphic and disturbing overtime.

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Thrillers from this time period began to change the focus of the characters slightly as plots became less about violent serial killers and murders and focused more on mental illness within themselves. Themes of violence were still prominent along with sex and obsession. A recent example of this would be the 2014 psychological thriller Gone Girl. Many believe the main character Amy Dunne to suffer from a mental illness known as Munchausen Syndrome where people physically harm themselves to gain attention from others.

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In this period, thriller films became a lot more violent and bloody. This was likely due to the success of Psycho which was heavy with scenes of violence and murder. In addition, the 60s was a period that was notable for its gang violence and killings which audiences may have wanted to be reflected in the films they watched. This lead to the release of the psychological horror-thriller Frenzy (1972) which is most known for its extremely graphic strangling scenes. Other violent thrillers from this time period include Straw Dogs (1971) and Fatal Attraction (1987)

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The sub-genre spy thriller also became popular with James Bond becoming a notable icon of the genre.

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One of the most famous thrillers directed by Hitchcock is Psycho. It was a turning point in the thriller genre as it fell into the sub genre of psychological triller and could be considered a hybrid with the horror genre.

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The film made 2.35 million USD in the box office and was one of Fox's most successful hit of the year.

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The thriller genre began to increase in popularity at this time due to the popularity in actresses such as Marilyn Monroe.
Monroe starred in the 1953 thriller film Niagara in which Rose (played by Monroe) plans to kill her murderous husband.

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Considered to be the "Master of Suspense".
He initiated the use of the term Macguffin which is a plot device such as a goal or wanted object that the character in a film is aiming for. It was a device he often incorporated into his thriller films.

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This was the first successful sound film (talkie) and was a thriller drama directed by Alfred Hitchcock.

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Technology for film in the early 1920s was quite limited. It wasn't until 1926 where experimental techniques (that had been developing in 1910) had come into use. A film style known as "Talkies" came into place that allowed for film to have a soundtrack and not be just silent.