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These results have been challenged by other researchers. IQ heritability increases during early childhood, but it is unclear whether it stabilizes thereafter. [14] A 1996 statement by the American Psychological Association gave about 0.45 for children and about .75 during and after adolescence. [15]
Stress during early childhood may also affect the child's development and have negative consequences on neural systems underlying fluid intelligence. A 2006 study found that IQ scores were related to the number of traumas and symptoms of post traumatic stress disorder (PTSD) in children and adults. [37]
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 ...
While education and childbearing place competing demands on a person's resources, education is positively correlated with IQ. [39] While there is less research into men's fertility and education, in developed countries evidence suggests that highly-educated men display higher levels of childbearing compared to less-educated men. [40] [41]
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 ...
A recent theory suggests that early childhood stress may affect the developing brain and cause negative effects. [47] Exposure to violence in childhood has been associated with lower school grades [48] and lower IQ in children of all races. [49]