The use of dissonant(不协调的) tones and noises is another technique that heightens tensions.Humans will naturally become uneasy when we hear dissonant sounds because such noises are typically associated with danger，like those that animals make to warn against predators(捕食者)．As a result，countless horror movies soundtracks use instrument combinations like double basses and high，screeching(尖刺的) violins.

　　As vital as it is，the best film music is subtle(巧妙的)．All that audiences are supposed to feel is a heightened sense of emotion—they shouldn’t realize what has caused it.Only when the music is taken out of the film should audiences understand its effects.

　　In keeping with this principle，some film makers are even using what’s called “infrasound(次声波)” to bring about fear.While we may not be able to hear it because its frequency is below that range of the human ear，infrasound has been proven to cause anxiety，shivering (颤抖) and even sorrow.For example，infrasound was used in the soundtrack of the 2007 horror movie Paranormal Activity，and audiences reported extremely high fear levels despite the lack of action throughout the movie.“It doesn’t affect everyone equally，” said British science writer Philip Ball，but he predicted that “we all see more of it in movies in the future”．

　　1．What is the article mainly about?

　　A．The differences between horror movies and comedies.

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