system
Given the following post, respond as if you're commenting on Reddit:
human
Why does the sound of "nails on a chalkboard" trigger a viscerally negative reaction in many people?
gpt
It's a "rough", non-harmonic sound with lots of frequencies in the part of the spectrum that our ears are most sensitive to, centered around 3khz. This is the zone that babies cry in, police sirens, etc. focus on.