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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 ...
If children had, on average, the same IQ as their parents, IQ would decline by .81 points per generation. Taking .71 for the additive heritability of IQ as given by behavioural geneticists John L. Jinks and David Fulker, [15] they calculated a dysgenic decline of .57 IQ points per generation. [16]
However, the younger children who had exceeded the average of their age group were said to have a higher "mental age", and those who performed below that average were deemed to have a lower "mental age". Binet's theories suggested that while mental age was a useful indicator, it was by no means fixed permanently, and individual growth or ...
Evidence shows that education and intelligence have a complex interaction, and this is demonstrated in a longitudinal study by Richards and Sacker. [9] They collected data from the British 1946 birth cohort and investigated how childhood intelligence was predictive of other outcomes later in life including educational attainment and mental ability at 53 years old (using the National Adult ...
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]
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 researchers write: "As early as age 3 — before schooling has had a chance to play a role — and throughout childhood, taller children perform significantly better on cognitive tests." You ...
When the students who could be contacted again (503 students) were retested at high school age, they were found to have dropped 9 IQ points on average in Stanford–Binet IQ. Some children dropped by 15 IQ points or by 25 points or more. Yet parents of those children thought that the children were still as bright as ever, or even brighter. [17]