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Modern human cranial size over the last 300 ka using data consolidated into 100-year means according to one 2022 study [6]...and for the last 30 ka [6]. From early primates to hominids and finally to Homo sapiens, the brain gets progressively larger - with the exception of extinct Neanderthals whose brain size exceeded that of modern Homo sapiens.
The minimum cranial capacity for the species Homo sapiens is generally set at 900cc. [ 1 ] One of the reasons for the proposal to exclude Homo habilis from the genus Homo , and renaming it as " Australopithecus habilis ", is the small capacity of their cranium (363cc -600 cc).
The evolutionary history of the human brain shows primarily a gradually bigger brain relative to body size during the evolutionary path from early primates to hominins and finally to Homo sapiens. This trend that has led to the present day human brain size indicates that there has been a 2-3 factor increase in size over the past 3 million years ...
The human brain stands out among the mammals because of its relative size compared to the rest of the body. The brain of Homo sapiens is about three times larger than that of its closest living relative, the chimpanzee. For a primate of its body size, the relative size of the brain and that of the digestive tract is rather unexpected; the ...
For 28 modern human specimens from 190 to 25 thousand years ago, average brain volume was estimated to have been about 1,478 cc (90.2 cu in), and for 13 Cro-Magnons about 1,514 cc (92.4 cu in). In comparison, present-day humans average 1,350 cc (82 cu in), which is notably smaller.
This is about the same size as the modern bonobo and female chimpanzee brain; it is somewhat smaller than the brain of australopithecines like Lucy (400 to 550 cm 3) and slightly over a fifth the size of the modern Homo sapiens brain.