Eyebrows lack an obvious function. Does new research solve the riddle of these thin arcs of facial hair?
This article was originally published at The Conversation and has been republished under Creative Commons.
We all know that ancient species of humans, such as Neanderthals, looked a little bit different from us. But the most obvious difference is that archaic humans possessed a pronounced and very distinctive brow ridge, which contrasts with our own flat and vertical foreheads. And for scientists, this difference between us and them has been the hardest to explain.
So my colleagues, Ricardo Godinho and Paul O’Higgins, and I looked at the iconic brow ridge of a fossilized skull to find out more about its purpose. Godinho used 3D engineering software to shave back Kabwe’s huge brow ridge. And in doing so, he found that Kabwe 1’s heavy brow offered no spatial advantage.
Although the loss of the brow ridge may have initially been driven by changes in our brain or facial reduction, it subsequently allowed our eyebrows to make many different subtle and friendly gestures to people around us.Expressing emotions Historically speaking, these marked changes in the face occurred at a time when the emergence of important social changes began to take place—mainly, the collaboration between distantly related groups of humans.
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