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On measures of cognitive ability (IQ tests) and school performance, black children in the U.S. have performed worse than white children. At the time of the study, the gap in average performance between the two groups of children was approximately one standard deviation, which is equivalent to about 15 IQ points or 4 grade levels at high school graduation.
Stressing the similarity of average IQ scores across racial groups in the Eyferth study, James Flynn, Richard E. Nisbett, Nathan Brody, and others have interpreted it as supporting the notion that IQ differences between whites and blacks observed in many other studies are mostly or wholly cultural or environmental in origin. [10]
Jensen's own research suggests that IQ tests amalgamate two forms of thinking which are hierarchically related but which become differentially distributed in the population according to SES: level 1 and level 2, associative learning and abstract thinking (g), respectively. Blacks do as well as whites on tests of associative learning, but they ...
Percentage of children aged 1–5 with blood lead levels at least 10 μg/dL. Black and Hispanic children have much higher levels than white children. A 10 μg/dL increase in blood lead at 24 months is associated with a 5.8-point decline in IQ. [77]
Intelligence quotient (IQ) tests do correlate with one another and that the view that the general intelligence factor (g) is a statistical artifact is a minority one. IQ scores are fairly stable during development in the sense that while a child's reasoning ability increases, the child's relative ranking in comparison to that of other ...
Leading up to the 1990s, IQ scores were consistently going up, but in recent years, that trend seems to have flipped. The reasons for both the increase and the decline are sill very much up for ...
The gap of the IQ between white and black students was a subject of debate in the United States, particularly around the 1970s. One view, which is referred to among behavioral geneticists as the genetic position, holds that IQ is determined by hereditary factors - about 80 percent of the variability of intelligence while 20 percent is attributed to environmental factors. [3]
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