Repulsion is a 1965 horror film from director Roman Polanski.  Catherine Deneuve plays Carol, a young woman who descends into madness as her sister goes on a vacation and leaves her alone in their home. 

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Similarities between Repulsion and Hitchcock’s Psycho seem to indicate that Psycho influenced Repulsion to a certain extent.  Both films focus on seemingly normal people who are actually insane murderers.  The murderers in both films are somewhat isolated from society and seem to have slipped into madness as a result of traumatic events in their childhoods. 

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Additionally, the killers both commit their murders in their own homes.  Stylistically, both films were made in black and white, and music and sound play a critical role in their effectiveness.  The films also use animals for symbolism: Psycho features birds extensively, and Repulsion features a dead rabbit in many scenes.

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The reference that most clearly demonstrates the “Hitchcockian” nature of Repulsion occurs as the opening credits of Repulsion allude to the shot of Marion’s eye after she has been murdered in Psycho.