This is one full minute of what may be the most annoying sound ever. 10, 2012.News release, New Castle University. Annoying Speaker Pulsing Listen to all of it it will make you cry. "This might be a new inroad into emotional disorders and disorders like tinnitus and migraine in which there seems to be heightened perception of the unpleasant aspects of sounds." "This work sheds new light on the interaction of the amygdala and the auditory cortex," says researcher Tim Griffiths of Newcastle University. Researchers say the results should help scientists better understand how the brain reacts to noise as well as disorders that affect people's perception of sound. "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." "This is the frequency range where our ears are most sensitive," says Kumar. The study also shows that sounds in the higher-frequency range of around 2,000 to 5,000 Hz were rated as most unpleasant.
Researchers found the part of the brain that regulates emotions, the amygdala, appears to take over the. Researchers say this spike in emotional activity heightened people's perception of annoying sounds compared with soothing ones, like bubbling water or a baby laughing. A new study shows annoying sounds trigger a highly emotional response in the brain. When listeners heard an annoying sound, activity in the amygdala increased and took over regulation of the auditory part of the brain. The study shows that activity in the amygdala and auditory complex varies according to the perceived unpleasantness of the sound. On the other end of the spectrum, though, are the least unpleasant sounds among the group. The results, published in the Journal of Neuroscience, show the top 10 most unpleasant sounds (and you can click on the first five to hear the sound): The participants rated each sound from most annoying or unpleasant to pleasant. Using functional magnetic resonance imaging (fMRI), researchers looked at activity in the brains of 13 healthy volunteers when they heard a range of 74 different sounds. The results suggest that a heightened emotional response in the brain to certain unpleasant sounds may alter people’s perception of them.
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