The scraping of metal on glass, a fork scratching on a plate, the creak of a rusty door or the screeching of a sounding microphone — from these unpleasant sounds, any person’s hair literally stands on end.
This is the most sensitive range for the human ear. It is assumed that this feature of our psychoacoustics is directly related to evolution.
Nasty squeaks increase the activity of the amygdala
During the period of evolutionary development, when a man was little different from a monkey and ran across the savannah, the small brain made it possible to quickly respond to a threat — to dodge a blow, prepare for battle, or take flight before consciousness turned on.
With an alarm. Crying baby, scared cry and how
It has been observed that such signals alter the electrical conductivity of the skin and subconsciously tense the muscles.
The ancient representatives of the genus Homo heard sounds in a given range in a situation where escape was no longer possible. The individual was required to come to the aid of a wounded relative, protect a child, or take a battle with an attacking predator.
Nevertheless, it is better not to annoy the squeaks of loved ones, as this awakens the animal nature hidden somewhere deep inside each of us.