The Worst Sounds In The World

The most annoying sound in the world is the scrape of a knife down the side of a glass bottle - with the horrible screech of nails on a blackboard placing in fifth.

The chart is based on magnetic brain images of how sounds provoke a response within the amygdala, the brain's 'emotion centre'.  People also find nails on a blackboard, bicycle brakes, and electric drills highly unpleasant.

The research hints that we evolved this response long before blackboards, bottles and even knives existed.

All the sounds in the top ten are similar in frequency range to human distress signals such as female screams or babies cvrying.

"It appears there is something very primitive kicking in," says Dr Sukhbinder Kumar, the paper's author from Newcastle University. "It's a possible distress signal from the amygdala to the auditory cortex."

All the sounds come from roughly the same range of high-pitched frequencies, say the Newcastle scientists that made the discovery. Anything in frequency range of around 2,000 to 5,000 Hz was found to be unpleasant. Dr Kumar explains: "This is the frequency range where our ears are most sensitive. Although there's still much debate as to why our ears are most sensitive in this range, it does include sounds of screams which we find intrinsically unpleasant."

The worst sounds in the world

1. Knife on a bottle
2. Fork on a glass
3. Chalk on a blackboard
4. Ruler on a bottle
5. Nails on a blackboard
6. Female scream
7. Anglegrinder
8. Brakes on a cycle squealing
9. Baby crying
10. Electric drill

 

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Kadang2 bunyi2 yang kat atas ni, bikin gigi KA jadi nyilu semacam je He He He!