What exactly is that “chill down your spine” feeling when we hear sounds like nails on a chalkboard?
In: Biology
There’s no way of knowing, but one hypothesis is that this is a vestigial trait, like the tailbone or the fact that some people can wiggle their ears.
This is the same frequency as the squeal of small mammals in distress. So this would be a holdback from the distant evolutionary past when the ancestors of primates were small shrew-like animals.
Much like when listening to music and having chills, certain frequencies are hard wired to our brains over time. These sounds produce a fight or flight response subconsciously releasing endocrine or dopamine and many other chemicals. This response can also make you perceive your teeth as in pain. As far as tasting metal your body could be releasing hormones that cause a symptom called dysgeusia.
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