Squeaking sounds can cause people to close their ears or grimace, as if they feel physical pain. Mostly goose bumps and the cold showers are added.
Why does squeaking cause goose bumps?
What's so bad about squeaky sounds and why are they bothering us so much that we'd like to run away when we hear them?
For our time, this reaction is completely covered and even looks a bit silly. After all, it's just a sound caused by chalk on the blackboard, a door, or two balloons rubbing against each other.
This reaction is far behind in our evolutionary history. Its roots are deeply rooted in us and come from a time in which high and shrill tones meant danger.
If our ancestors heard these kinds of sounds in prehistoric times, they could only run away or oppose the attacker. If it was already too late to run away, our ancestors needed a scary look. They achieved this by the fact that their skin contracted (goosebumps) and the hair straightened up on the body.
Such things can still be seen in animals today when they adopt a dangerous attitude. The goose bumps that we feel today, when something squeaks loudly, set up with us only the small, almost invisible hairs. In our ancestors, however, this was different, since they still had full hair on the entire body.
Researchers found that a pitch in the 2000-5000 Hertz range makes us uncomfortable. Incidentally, we also send out this pitch ourselves when we feel threatened and cry out for help.
This frequency triggers emotions in the amygdala (a part of the limbic system) that the primitive man already knew and drives us on the backs and arms on the goose bumps, even if no dense fur has been growing there for a long time.