Scientists have found an answer to why the sound of nails scraping down a blackboard is so unpleasant that it makes us wince.
Heightened activity between the emotional and auditory parts of the brain explains why we grimace when a knife is scratched against a bottle.
Newcastle University scientists have revealed the interaction between the region of the brain that processes sound, the auditory cortex, and the amygdala, which is active in the processing of negative emotions when we hear unpleasant sounds.
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