It's so universal that it's become a cliché: nails on a chalkboard! When
it comes to noises that bother everyone's ears, it's seemingly a given
that scraping fingernails across a slate board is the one that everyone
hates most. But when a group of neuroscientists decided to test which
sounds most upset the human brain, they discovered that fingernails on a
chalkboard isn't number one.
It's not even number two. As part of their research, published last week
in the Journal of Neuroscience, they put 16 participants in an MRI
machine, played them a range of 74 different sounds and asked them to
rate which were
most annoying.
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