Why Do the Sounds of a Scraping Knife on a Plate & Fingernails on a Chalkboard Make Humans Cringe?

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In this video:

Few sounds cause humans to cringe more than nails across a chalkboard, a fork scraped on a plate, or a heavy metal chair dragged across a tiled floor. But what exactly is it about this sort of scraping noise that is so offensive to our brains that many even describe it as painful?

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