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The dimensions of a 1.8 million years old adult female H. e. ergaster pelvis from Gona, Ethiopia, suggests that she would have been capable of birthing children with a maximum prenatal brain size of 315 cc (19.2 cu in), about 30–50% of adult brain size, falling between chimpanzees (~40%) and modern humans (28%). [66]
The size of the brain is a frequent topic of study within the fields of anatomy, biological anthropology, animal science and evolution.Measuring brain size and cranial capacity is relevant both to humans and other animals, and can be done by weight or volume via MRI scans, by skull volume, or by neuroimaging intelligence testing.
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Further conclusions about the growth and development in early Homo can be drawn from the Mojokerto child, a ~1.4–1.5 million year old ~1-year old Asian H. erectus, which had a brain at about 72–84% the size of an adult H. erectus brain, which suggests a brain growth trajectory more similar to that of other great apes than of modern humans. [52]
D4500's features are very rare compared to early Homo in that it had a small braincase yet an unusually large prognathic face. [2] "Skull 5" has an accompanying mandible, D2600, which was found in 2000. In 1999 two other skulls had been found at the same site—D2280 and D2282. D2280 was a near-complete brain-case with 780 cc brain-size.
KNM ER 3733 is one of the oldest Homo ergaster skulls in the world. Recent research using magnetostratigraphy has determined the age of KNM-ER 3733 to be 1.63 ± 0.15 million years old. [1] KNM ER 3733 is a find of a near-complete cranium. Its brain size is about 850ccm.