Why do sour/bitter tastes make us change our face expression?
In: Biology
There’s a communication component to it. If you see someone eat something then scrunch up their face you know what to expect when you eat the thing they’re eating. Without those specific facial expressions (like disgust, which can be seen even in newborns) we might all try the same food and die from it.
Surprising uncomfortable stimulation tends to cause muscle contraction. It’s like if you get an unexpected touch from a cold hand, you’ll also probably tense up wherever you got touched
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