Why do many human beings have such an aversion to 'scraping' noises?

Question

e.g., the sound made by ceramics scraping against ceramics, or metals against metals.

Why is this the case?

Answer 1

Me, just even thinking about somebody scratching a blackboard UGH

Answer 2

chalk on a chalkboard...I hate that - sends a shiver down my spine just thinking about it for some reason.

even worse - stratching my nails down the chalkboard - ergh !

Answer 3

I've never had the 'fingernail-chalkboard' aversion.  Guess I'm just abnormal that way....

Here are some interesting theories as to why it annoys people:

http://en.wikipedia.org/wiki/Sound_of_fi...

One thing I do hate is the edges of 2 dimes being rubbed together...

Answer 4

I have no idea. I do know that it bugs me so much when I hear a fork scraping  a plate. It just makes me cringe.

Hope you find an answer.