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Yet, although IQ differences between individuals have been shown to have a large hereditary component, it does not follow that between-group differences in average IQ have a genetic basis. [ 19 ] [ 20 ] [ 26 ] In fact, greater variation in IQ scores exists within each ethnic group than between them. [ 85 ]
An intelligence quotient (IQ) is a total score derived from a set of standardized tests or subtests designed to assess human intelligence. [1] Originally, IQ was a score obtained by dividing a person's mental age score, obtained by administering an intelligence test, by the person's chronological age, both expressed in terms of years and months.
The categories of IQ vary between IQ test publishers as the category labels for IQ score ranges are specific to each brand of test. The test publishers do not have a uniform practice of labeling IQ score ranges, nor do they have a consistent practice of dividing up IQ score ranges into categories of the same size or with the same boundary ...
Intelligence and personality have some common features; for example, they both follow a relatively stable pattern throughout the whole of one’s life, and are to some degree genetically determined. [1] [2] In addition, they are both significant predictors of various outcomes, such as educational achievement, occupational performance, and health.
However, it is difficult to disentangle possible genetic factors from a parent's attitude or use of language, for example. [4] A child's ordinal position in their family has also been shown to affect intelligence. A number of studies have indicated that as birth order increases IQ decreases with first borns having especially superior intelligence.
Although IQ differences between individuals have been shown to have a large hereditary component, it does not follow that mean group-level disparities (between-group differences) in IQ necessarily have a genetic basis. [140] [141] The scientific consensus is that there is no evidence for a genetic component behind IQ differences between racial ...
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"How Much Can We Boost IQ and Achievement?" is a 1969 article by Arthur Jensen published in the Harvard Educational Review. [1] Controversy over the article led to the coining of the term Jensenism , [ 2 ] defined as the theory that IQ is largely determined by genes, including racial heritage. [ 3 ]