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g many factors into account. For example, there is a kind of people who have extraordinary memory ability, talented in math or arts, but not very smart in the other aspect like language and social skill. Based on current criteria, it is not easy to say whether these people have high intelligence or low intelligence. Moreover, the social status of a person is hardly judged only by IQ. It was said that the former president Jorge bush’s IQ is below the average level, but he still won the presidency with his personal charisma.
 Moreover, trying to interpret the intelligence with differential gene expression patterns may neglect other important facts that also can contribute the difference between intelligence of modern human and primitive. The human brains are much bigger than primitives and the ratio of brain weight to the body weight is the highest among all the animals in our planet. The intelligence may be greatly improved just because we human have a big brain, which can process more information and remember more things.
In summary, the intelligence of human involves various factors. We have little knowledge about our brains as we have about the nature and the universe. There is still a long way to go for those researchers. 

 

referrence
[1] Deary IJ, Johnson W, Houlihan LM. Genetic foundations of human intelligence. Hum Genet. 2009 Jul;126(1):215-32.
[2] Deary IJ, Yang J, Davies G, Harris SE, Tenesa A, Liewald D, Luciano M, Lopez LM, Gow AJ, Corley J, Redmond P, Fox HC, Rowe SJ, Haggarty P, McNeill G, Goddard ME, Porteous DJ, Whalley LJ, Starr JM, Visscher PM. Genetic contributions to stability and change in intelligence from childhood to old age. Nature. 2012 Jan 18;482(7384):212-5.
[3] Tambs K, Sundet JM, Magnus P, Berg K. Genetic and environmental contributions to the covariance between occupational status, educational attainment, and IQ: a study of twins. Behav Genet. 1989 Mar;19(2):209-22.
[4] Vinkhuyzen AA, van der Sluis S, Maes HH, Posthuma D, Reconsidering the heritability of intelligence in adulthood: taking assortative mating and cultural transmission into account. Behav Genet. 2012 Mar;42(2):187-98.

 

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