Why do some sounds annoy us so much?

Why do some sounds annoy us so much?

It is known that in the frequency range of 2 000 to 4 000 Hz, our ear is the most sensitive. The grinding of the nails on the blackboard, traditionally one of the most unpleasant sounds for many people, falls into this range, just like children's crying. But while it is for certain it is not known, what still causes so negative emotions. In a 2006 study, the award Ig Nobel Prize, the scientists argued that these frequencies are very similar to those on which the chimps transmit an alarm. They assumed that by this alarm from the sound we owe instincts, a mechanism of protection from predators. But the most convincing at the moment is the assumption of neurobiologists that the tonsil sounds are excited by the amygdala - the region of the brain, often associated with the experience of fear.

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