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One study found that breastfeeding was linked to raised IQ (as much as 7 points when not controlling for maternal IQ) if the infants had an SNP coding for a "C" rather than G base within the FADS2 gene. Those with the "G" version showed no IQ advantage, suggesting a biochemical interaction of child's genes on the effect of breastfeeding.
Among the findings of cognitive epidemiology is that men with a higher IQ have less risk of dying from coronary heart disease. [20] The association is attenuated, but not removed, when controlling for socio-economic variables, such as educational attainment or income. This suggests that IQ may be an independent risk factor for mortality.
Although men have larger brains, men and women have equal IQs. [19] For men, the gray matter volume in the frontal and parietal lobes correlates with IQ; for women, the gray matter volume in the frontal lobe and Broca's area (which is used in language processing) correlates with IQ. [20]
Intelligence as measured by Psychometric tests has been found to be highly correlated with successful training and performance outcomes (e.g., adaptive performance), [76] [77] [78] and IQ/g is the single best predictor of successful job performance; however, some researchers although largely concurring with this finding have advised caution in ...
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). [12] [13] Pupil KABC-II WISC-III WJ-III Asher: 90: 95: 111 ...
Norwegian epidemiologists used military records to examine the birth order, health status, and IQ scores of nearly 250,000 18- and 19-year-old men born between 1967 and 1976.
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 ...
The notion of greater male variability—at least in respect to physical characteristics—can be traced back to the writings of Charles Darwin. [2] When he expounded his theory of sexual selection in The Descent of Man and Selection in Relation to Sex, Darwin cites some observations made by his contemporaries.