Out of 74 sounds, volunteers rated the five most unpleasant as:
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
I'm suprised this didn't make the list...
Why do nails on a chalkboard drive us crazy?
Scientists say our reaction to the
sound of scraping nails – which is in the same frequency range as screams and
babies' cries – could be an ancient survival instinct.
The study scanned the brains of 13
volunteers while they listened to a range of sounds before rating how much they
The more unpleasant a sound, the
greater an almond-shaped
brain region known as the 'amygdala' lit up.
It then activated the auditory cortex,
which processes sound, leading the volunteers to perceive the noise more keenly.