Range of expressions for emotions. The only way we can measure them??
If emotion/pain detectors rely solely on facial expression, what happens when that facial expression is absent?
It's our way of making something abstract into a concrete thing we can see and analyze. Without asking someone how they "feel", their faces often give it away.
Additionally, this pain chart indicates that something as intangible as pain is easier to assess when paired with different degrees of frowns.
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