The Terror of Diegetic Sound Effects
Diegetic sound effects in horror films are crucial for creating an unsettling atmosphere, as they originate directly from the scene, enhancing the realism and overall ambiance.
Since they are perceived by both the characters and the audience, they significantly heighten the emotional intensity of scenes, creating a much more authentic and immersive experience.
Some examples?
In Alien (1979), the metallic noises and sounds of the spaceship Nostromo, such as the doors opening and closing, increase the sense of isolation and danger. 
In The Ring (2002), the sound of the television being on, with the VHS tape running, creates an atmosphere of dread every time the cursed video is played. 
In Sinister (2012), the sound of the projector playing the disturbing home videos adds an even more sinister element during the discovery of the crimes. 
In The Blair Witch Project (1999), the sounds of breaking branches and mysterious, unsettling noises in the woods at night heighten the paranoia and sense of being pursued. 
In The Texas Chainsaw Massacre (1974), the sound of Leatherface’s chainsaw is terrifyingly menacing and creates palpable tension, underscoring—if needed—the extreme brutality of the scenes. 
Thus, diegetic sound effects in horror films are truly powerful tools for creating tension and fear. By using sounds that seem to come directly from the film’s environment, directors can craft an authentic experience that engages viewers on a deep, instinctive level, making the horror even more tangible and real.
The Terror of Diegetic Sound Effects
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