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The amount they improved was directly related to the adopting family's socioeconomic status. "Children adopted by farmers and laborers had average IQ scores of 85.5; those placed with middle-class families had average scores of 92. The average IQ scores of youngsters placed in well-to-do homes climbed more than 20 points, to 98." [41] [49]
IQ and educational attainment are strongly correlated (estimates range form .40 to over .60. [11]) There is controversy, however, as to whether education affects intelligence – it may be both a dependent and independent variable with regard to IQ. [4] A study by Ceci illustrates the numerous ways in which education can affect intelligence.
His discovery was confirmed later by many other studies. While trying to understand these remarkable test score increases, Flynn had postulated in 1987 that "IQ tests do not measure intelligence but rather a correlate with a weak causal link to intelligence". [135] [136] By 2009, however, Flynn felt that the IQ test score changes are real. He ...
If racial IQ gaps have a partially genetic basis, one might expect black people with a higher degree of European ancestry to score higher on IQ tests than black people with less European ancestry, because the genes inherited from European ancestors would likely include some genes with a positive effect on IQ. [173]
Health can affect intelligence in various ways. Conversely, intelligence can affect health. Health effects on intelligence have been described as being among the most important factors in the origins of human group differences in IQ test scores and other measures of cognitive ability. [1]
IQ scores can differ to some degree for the same person on different IQ tests, so a person does not always belong to the same IQ score range each time the person is tested. (IQ score table data and pupil pseudonyms adapted from description of KABC-II norming study cited in Kaufman (2009). [86] [87]) Pupil KABC-II WISC-III WJ-III A: 90: 95: 111 ...
An international consortium of researchers found they could predict the volume of these structures using polygenic scores they developed using large cohorts from multiple ancestries.
IQ tests are valid measurements of a real human ability—what people generally describe as "intelligence"—that is important to many parts of contemporary life. Intelligence, as measured by IQ tests, is about 80 percent heritable. Intelligent parents are much more likely to have intelligent children than other parents.
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