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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Sources:

https://en.wikipedia.org/wiki/Psychoacoustics
https://en.wikipedia.org/wiki/Amygdala
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4079659/
https://doi.org/10.1121/1.3655174
https://web.mit.edu/jhm/www/Pubs/McDermott_2004_monkey_consonance_preferences.pdf
https://en.wikipedia.org/wiki/Reticular_formation
https://www.pnas.org/content/pnas/early/2015/09/24/1500968112.full.pdf
https://www.ncbi.nlm.nih.gov/pubmed/20628439
https://www.ncbi.nlm.nih.gov/pubmed/20628439
https://en.wikipedia.org/wiki/Chimpanzee%E2%80%93human_last_common_ancestor
https://en.wikipedia.org/wiki/Fight-or-flight_response
http://www.dangerousdecibels.org/virtualexhibit/6measuringsound.html
https://books.google.com/books?id=ITlXDwAAQBAJ&pg=PA83&lpg=PA83&dq=cotton-top+tamarin+white+noise+nails+on+a+chalkboard&source=bl&ots=jE5eBFnV9g&sig=ACfU3U1-IUyD-SD6V61ixQ4d-WelQXIsVg&hl=en&sa=X&ved=2ahUKEwjhhKus1O3mAhUBvZ4KHX7wDGUQ6AEwFXoECBkQAQ#v=onepage&q=cotton-top%20tamarin%20white%20noise%20nails%20on%20a%20chalkboard&f=false
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3092984/
https://www.dpamicrophones.com/mic-university/facts-about-speech-intelligibility
https://www.frontiersin.org/articles/10.3389/fpsyg.2014.00587/full
https://www.sciencedaily.com/releases/2009/03/090319132956.htm
https://www.frontiersin.org/articles/10.3389/fpsyg.2017.00131/full
https://www.frontiersin.org/articles/10.3389/fpsyg.2014.00587/full
https://www.sciencedaily.com/releases/2009/03/090319132956.htm

Видео Why Do the Sounds of a Scraping Knife on a Plate & Fingernails on a Chalkboard Make Humans Cringe? канала Today I Found Out