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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]
In men the average weight is about 1370 g and in women about 1200 g. [4] [contradictory] The volume is around 1260 cm 3 in men and 1130 cm 3 in women, although there is substantial individual variation. [5] Yet another study found that adult human brain weight is 1300–1400 g for adult humans and 350–400 g for newborn humans.
IQ Range ("deviation IQ") IQ Classification Percent Included 128 and over Very Superior 2.2 120–127 Superior 6.7 111–119 Bright Normal 16.1 91–110 Average 50.0 80–90 Dull normal 16.1 66–79 Borderline 6.7 65 and below Defective 2.2
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.
A man in France continues to puzzle scientists nearly a decade after he was found to be living with just 10 percent of a typical human brain. ... the patient was a 44-year-old man who had been ...
Bartzokis et al., has noted that there is a decrease in grey matter volume between adulthood and old age, whereas white matter volume was found to increase from age 19–40, and decline after this age. [13]
Taking into account measurement quality, and sample type and IQ-range, the meta-analytic association of brain volume in appears to be ~ .4 in normal adults. [15] Researcher Jakob Pietschnig argued that the strength of the positive association of brain volume and IQ remains robust, but has been overestimated in the literature.
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.