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The brain size of H. erectus varies considerably, but is generally smaller in H. erectus sensu lato, as low as 546 cc (33.3 cu in) in Dmanisi skull 5. [53] Asian H. erectus overall are rather big-brained, averaging roughly 1,000 cc, [ 46 ] staying within the range of variation for modern humans. [ 54 ]
The size of the brain is a frequent topic of study within the fields of anatomy, ... Homo erectus; 850–1100 cm 3; Australopithecus anamensis; 365–370 cm 3 [81]
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.
The most important is its brain size, which falls between 1,155 and 1,421 cc, [20] with an approximate average of 1,200 cc. [12] The average brain size of Asian H. erectus is about 1,000 cc, [36] with mostly towards the lower range up to 800 cc; [37] while early H. sapiens have the brain size ranging from 1,200 to 1,400 cc. [38]
The cranial capacity of the Dmanisi hominins ranges from 546 to 775 cc, [4] with an average of 631 cc. [64] As such, their brain size overlaps with that of H. habilis (c. 548–680 cc) and falls below the standard cranial capacity otherwise ascribed to H. erectus and H. ergaster (800–1000 cc). [4]
Asian H. erectus overall are rather big-brained, averaging roughly 1,000 cc. [89] Encephalisation quotients (the ratio between observed to predicted brain mass for an animal of a given size, cautiously used as an indicator of intelligence) typically score from three to four for "classic" H. erectus assuming a body weight on the whereabouts of ...
[19]: 136 Overall, Asian H. erectus are big-brained, averaging roughly 1,000 cc (61 cu in). [20] For comparison, a 1955 survey of 63 Aboriginal Australians reported a brain volume range of 943 to 1,399 cc (57.5 to 85.4 cu in); that is, Asian H. erectus brain volume fits within the modern human range of variation. [21]
The Dmanisi skull, also known as Skull 5 or D4500, is one of five skulls discovered in Dmanisi, Georgia and classified as early Homo erectus.Described in a publication in October 2013, it is estimated to be about 1.8 million years old and is the most complete skull of a Pleistocene Homo species, [1] [2] and the first complete adult hominin skull of that degree of antiquity.