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[179] [180] Some scholars have reported differences in average brain sizes between racial groups, [181] although this is unlikely to be a good measure of IQ as brain size also differs between men and women, but without significant differences in IQ. [76]
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.
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]
There were about 98 mixed race (black-white), and about 83 white children in the sample. [5] The total sample consisted of about 5 percent of the German children known to have been fathered by black soldiers between 1945 and 1953, in addition to a matched sample of 83 German children whose fathers were white soldiers.
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 section in IQ and human intelligence (1998) by Nicholas Mackintosh discussed ethnic groups and Race and intelligence: separating science from myth (2002) edited by Jefferson Fish presented further commentary on The Bell Curve by anthropologists, psychologists, sociologists, historians, biologists and statisticians. [154]
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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.