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is what anthropologists argued enabled us and our relatives to perform more complex tasks such as using fire, forging and wielding tools, making art and domesticating animals.were short-statured, at just over 3 feet tall, and had a chimp-size brain.
This discovery upended the assumption that brains have been increasing in size over the past several million years and generated confusion about what separates recent human relatives in our genus Our previous work on the proportions of molar teeth generated new insights into the evolution of pregnancy by demonstrating thatin primates. Now, we wanted to see whether we could uncover a relationship between tooth proportions and brain size among our fossil relatives.. If tooth proportions can provide information about fossil brain size, it opens up a world of possibilities for assessing past changes in encephalization.We collated data on tooth and brain size for 15 fossil species on the human family tree, spanning about 5 million years of evolution. Somewhat oxymoronically, the third molars – otherwise known as wisdom teeth – have gotten proportionally smaller as brain size has gotten larger throughout human evolution, for most species., had relatively smaller third molars, compared to their other teeth, and larger brains. This relationship allows researchers to figure out something about brain size for fossils that are incomplete, perhaps existing only as a few lone teeth. Since teeth are predominately made of inorganic matter, they survive in the fossil record much more often than other parts of the body, making up theHomo floresiensis,Scientists recognize now that the formation of the brain and the teeth are inextricably connected during gestation. And for most species, larger brains are correlated with smaller wisdom teeth.. But their brains are also small, which is quite unusual. There are two primary ways for brain size to decrease: by slowing down growth during gestation before birth or by slowing down growth after birth, during childhood. Because teeth develop early in gestation, slowing down growth rates during pregnancy tends to affect tooth shape and size, or even Slowing growth later, during childhood, influences skeletal shape and size in other ways, because different parts of the body develop at different times.The Hobbits' small wisdom teeth suggest that, at least in utero, they were on track for the proportionally bigger brains that are the trademark of humans and their relatives. Any brake that slowed down brain growth likely occurred after birth.was likely an adaptation to the unique conditions of their island environment on Flores.. There are many examples of other mammals becoming small on islands over the past 60 million years. But one of the most relevant examples is the dwarf elephant,no less intelligent than people with larger brains. Variation in body size dictates brain size; it is not a measure of cognitive ability. The island HobbitsOur research supports that their small body size originated from a slowdown in growth during childhood. But this process would likely have had little impact on brain function or cognitive ability. We hypothesize that the Hobbits were small but highly capable.New research, including our study, continues to reinforce the importance of understanding how pregnancy and child growth and development evolved. If we want to know what distinguishes humans from our evolutionary ancestors, and how we evolved, we must understand how the earliest moments of life have changed and why. Our work also encourages the reevaluation of endless attention on increasing brain size as the predominant force in human evolution. Other species in genus
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