Horror movie soundtracks sometimes include infrasound, which is sound below the range of human hearing. Even though we can’t hear it we can still feel it and infrasound has been shown to induce anxiety, heart palpitations, and shivering.

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The simplest examples of this are found in thriller and horror films, which employ dissonant, screeching sounds we unconsciously associate with animals in distress.

A 2010 study by the University of California found that human sensitivity to non-linear alarm sounds, such as ones made by groundhogs to warn about predators, is being employed by film composers to unsettle and unnerve.

In films like Hitchcock’s 1960 classic Psycho, straining strings and overblowing brass are mimicking the noise of panic in nature.

Read more at BBC