Race and sex differences in head size and IQ

@article{Jensen1994RaceAS,
  title={Race and sex differences in head size and IQ},
  author={Arthur Robert Jensen and Fred W. Johnson},
  journal={Intelligence},
  year={1994},
  volume={18},
  pages={309-333}
}
Brain size and cognitive ability: Correlations with age, sex, social class, and race
TLDR
It is clear that the direction of the brain-size/cognitive-ability relationships described by Paul Broca, Francis Galton, and other nineteenth-century visionaries is true, and the null hypothesis of no relation, strongly advocated over the last half century, is false.
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Brain size does not predict general cognitive ability within families.
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Within-family sibling differences for several neuroanatomical measures were correlated to WF scores on a diverse battery of cognitive tests in a sample of 36 sibling pairs, suggesting that nongenetic influences play a role in brain volume/cognitive ability associations.
The Evolution of Brain Size and Intelligence
In this chapter, we update our earlier reviews of the literature (Rushton & Ankney, 1996, 1997) on the relation between whole brain size and general intelligence (IQ). In 55 samples in which IQ
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