|The study found that humans are
able to mobilise powerful jaw muscles when biting, which places less stress on the skull.
Humans Prove to Have a Mighty Bite
Size matters, but efficiency matters more
The robust jaws and formidable teeth of some of our ancestors and ape cousins may suggest that humans are wimps when it comes to producing a powerful bite; but a new study has found the opposite is true, with major implications for our understanding of diet in ancestral humans.
The surprise findings suggest that early modern humans did not necessarily need to use tools and cooking to process high-nutrient hard foods, such as nuts — and perhaps less tough foods such as meat — but may have lost an ability to eat very tough items, such as tubers or leaves.
In the first comparison of its kind, Australian researchers have found that the lightly built human skull has a far more efficient bite than those of the chimp, gorilla and orangutan, and of two prehistoric members of our family, Australopithecus africanus and Paranthropus boisei.
They found that modern humans can achieve relatively high bite forces using less-powerful jaw muscles. In short, the human skull does not have to be as robust because, for any given bite force, the sum of forces acting on the human skull is much less.
“When we’re biting down in vertical plane, at the back of the jaw our bite is about 40-50 percent more efficient than it is for all great apes,” says Dr. Stephen Wroe, leader of the study. “It’s even more efficient when biting at the front of the jaw. Size matters, but efficiency matters more — and humans are very efficient biters.”
These results also explain the apparent inconsistency of very thick tooth enamel in modern humans — a feature typically associated with high bite forces in other species. Thick enamel and large human tooth roots are well adapted to take high loads when biting.
Researchers used sophisticated three-dimensional (3D) finite element analysis to compare digital models of actual skulls that had been CAT-scanned.
The technique, adapted from engineering, provides a highly detailed view of where stresses occur in materials under loads designed to mimic actual scenarios. The team has previously used this approach to study the jaw mechanics of living and extinct species, such as the great white shark and the sabre-toothed tiger.
These results call into question previous suggestions that the evolution of a less robust skull in modern humans involved a trade-off for a weaker bite or was a response to behavioral changes, such as switching to softer foods or more processing of foods with tools and cooking. It has also been suggested that human jaw muscles were reduced to make way for a larger brain.
“However plausible those ideas may seem, they have been based on very little by way of comparative data: for example, there are no actual records of bite force collected from living members of any other ape species,” says Wroe. “It turns out that we don’t have a wimpish bite at all — it is very efficient and powerful.”
“Importantly though, our study focuses on the generation of peak bite forces over short time spans. The jaws of other species may be better adapted to maintain chewing over long periods. This means that although humans are up there with great apes in their ability to quickly crack open a hard item, such as a large nut, or process less tough foods, such as meat, they may be less well adapted to process tough material, such as leaves or bamboo, which requires sustained chewing over a long period.”
The study appears in a paper in the journal Proceedings of the Royal Society B by a team led by Wroe, of the Computational Biomechanics Research Group in the UNSW’s School of Biological, Earth and Environmental Sciences.