A knife scraping against a glass bottle is the most unpleasant sound for most human beings, researchers from the Newcastle University and Wellcome Trust Centre for Neuroimaging at UCL, both in England, reported in the Journal of Neuroscience. When activity between the auditory and emotional parts of the brain increases, it may cause a sensation of revulsion or disgust at a sound, as typically occurs to most of us when we hear somebody scrape chalk or their nails on a blackboard...
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