U.S.A. studies to reveal: The social competition impels ancient mankind's brain capacity to increase

U.S.A. studies to reveal: The social competition impels ancient mankind's brain capacity to increase
U.S.A. Missouri university publishes the press Communique and says, the research of this university shows on the 22nd, the social competition may be the main reason causing ancient mankind's brain capacity to increase rapidly.According to American media, scientific research personnel have proposed many kinds of theories explain why increase ancient mankind's brain capacity fast before this, for example climatic change say and ecological demand say and the social competition is said etc.. In order to verify these theories, 175 pieces of ancient mankind skull which Missouri university researchers have collected during about 1,900,000 years ago and data of the unearthed place, have compared data such as the state,etc. prevail in population density, latitude of habitat, average temperature of the whole year and parasite that the ancient mankind lives in times. Found finally, the impact on ancient mankind's cephalic size and brain capacity of population density was maximum."Our research showed, the ancient mankind of the densely populated area, its capacity of brain was increased most, it must cause the social increased competition and densely populated, " The university artistic and scientific professors of institute David and Gearey of Missouri responsible for this research say, "when the ancient mankind must compete with the social status for the demand, larger brain capacity is a kind of advantage. "Researchers still find, climatic change contributes to the increase of ancient mankind's brain capacity too, but the importance does not compete as the society. (Reporter Ren HaiJun Www.xinhuanet.com)
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