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When talking about ancient history, it’s hard to be definitive. It’s very hard to come to firm conclusions about ancient human history “Say what?” Debrocke/ClassicStock/Getty Images Ultimately, expressive eyebrows are “a biological mechanism to demonstrate to other people what we’re genuinely feeling,” Spikins says, somewhat similar to blushing. Furrowed brows indicate worry or concentration. Think of all the ways our eyebrows can subtly tell those around us what we’re thinking. It’s also possible that as our foreheads grew larger, the muscles used to control our eyes and eyebrows became more complex and capable of subtle movement. It’s an instance where evolution of our physical anatomy reveals more about our minds than our environments. Whereas the strong brow ridge on the heidelbergensis signaled strength, our relatively massive foreheads allow for empathy. And that’s why the heavy brow ridges of our ancestors may have morphed into the lofty foreheads of today. For the heidelbergensis, prominent brows were just plain sexy, a desirable trait in a mate.īut as time passed, the need to assert dominance was less important and the need to empathize and communicate with others became more important.
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They were possibly a social signal, a sign of strength and dominance. Simply put, the brow ridges of our ancestors did not seem to serve a mechanical function. “And still it made no difference in how the face was biting.” “We reduced the brow ridge to the absolute minimum size possible for it to hold the face together,” says Paul O’Higgins, a University of York archeologist and a co-author of the paper. It turns out the heidelbergensis brow ridge is overbuilt. A smaller ridge ought to increase stresses on the skull. Using a three-dimensional computer model of a heidelbergensis skull, they manipulated the size of the brow ridge. They asked: Why did it have such a thick brow ridge in the first place? The common explanation is that the large brow gave the face additional stiffness and was useful in chewing tough meats. heidelbergensis skull - specifically a skull called Kabwe 1, which was discovered in 1921 and is currently in the Smithsonian. Spikins and her colleagues came to favor this hypothesis after an analysis of the H. How your eyebrows “speak” PhotoAlto/Getty Creative Images And as we became an increasingly social species engaged in increasingly sophisticated communication, they helped us survive. They are a canvas upon which our eyebrows can paint emotions. It’s this: Our foreheads facilitate empathy. So why did our foreheads become so distinct? The science on this question isn’t settled, but Spikins and her colleagues offer an intriguing new hypothesis published Monday in the journal Nature Ecology and Evolution.
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“The brow ridge is one of the most distinctive features that mark out the difference between archaic and modern humans,” says Penny Spikins, an evolutionary anthropologist at the University of York. Heidelbergensis lived around 700,000 to 200,000 years ago and is suspected to be a possible shared ancestor of Neanderthals, the recently discovered Denisovans, and modern humans.īut one place where modern human anatomy diverged from these and other ancestors’ anatomy was in the evolution of our smooth, long foreheads and our agile eyebrows. Via Nature Evolution and Ecology/The Natural History Museum On the left, the thick, severe brow of Homo heidelbergensis. You can see the difference easily when comparing skulls. grandparents had a skull that could hardly hold on to a hat, with a thick, protruding brow. If you were to run into our ancient ancestor Homo heidelbergensis on the street, the first thing you might notice is their small forehead and heavy brow.