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IQ goes from being weakly correlated with genetics for children, to being strongly correlated with genetics for late teens and adults. The heritability of IQ increases with the child's age and reaches a plateau at 14–16 [9] years old, continuing at that level well into adulthood. However, poor prenatal environment, malnutrition and disease ...
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.
In their mathematical model, with constant differences in fertility, since children's IQ can be more or less than that of their parents, a steady-state equilibrium is argued to be established between different subpopulations with different IQ. The mean IQ will not change in the absence of a change of the fertility differences. The steady-state ...
The relationship between IQ and academic performance has been shown to extend to one's children. In a study [11] measuring a range of family background characteristics they found that maternal IQ was a stronger predictor of children's test scores than any other family characteristics, including socioeconomic status. Maternal IQ predicted around ...
Since mother's IQ was predictive of whether a child was breastfed, the study concluded that "breast feeding [itself] has little or no effect on intelligence in children." Instead, it was the mother's IQ that had a significant correlation with the IQ of her offspring, whether the offspring was breastfed or was not breastfed. [8]
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.
They conclude that "in contrast to most studies on the association between childhood IQ and later health," their findings suggest "a high childhood IQ may prompt the adoption of behaviors that are ...
The Bell Curve: Intelligence and Class Structure in American Life is a 1994 book by the psychologist Richard J. Herrnstein and the political scientist Charles Murray in which the authors argue that human intelligence is substantially influenced by both inherited and environmental factors and that it is a better predictor of many personal outcomes, including financial income, job performance ...