Race and sex differences in head size and IQ

  title={Race and sex differences in head size and IQ},
  author={Arthur Robert Jensen and Fred W. Johnson},
Brain size and cognitive ability: Correlations with age, sex, social class, and race
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.
Cranial size and IQ in Asian Americans from birth to age seven
Psychometric g related to differences in head size
Brain size does not predict general cognitive ability within families.
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


Biological factors and psychometric intelligence: a review.
  • F. Johnson
  • Psychology
    Genetic, social, and general psychology monographs
  • 1991
Prenatal effects are not an important source of bias in twin studies or for heritability estimates based on them, and within-family studies indicated that pleiotropy may contribute to the correlation of intelligence with head size and to the connection with body size.
Intelligence and brain structure in normal individuals.
The results suggest that the size of some cerebral structures may account for a significant, but modest, proportion of the variance in human intelligence.
Race, Brain Size, and Intelligence: A Reply to Cernovsky
Evidence is reviewed on the relation betweenbrain size and race and (b) brain size and intelligence and that Mongoloid populations have larger and heavier brains than Caucasoids.
Analysis of brain weight. I. Adult brain weight in relation to sex, race, and age.
Analysis of the brain weight of 1,261 subjects, aged 25 to 80 years, shows that the mean brain weight decreases in order from white men to black men to white women to black women, and between white men and white women.
Sex differences in relative brain size: The mismeasure of woman, too?
Cultural Correlates with Cranial Capacity
presentations. Several pieces of indirect evidence suggest biocultural interpretations for encephalization (Beals 1987). First, expansion of the brain case has been greater than is explicable by the
Brain Size, Cranial Morphology, Climate, and Time Machines [and Comments and Reply]
Relations between body size and brain size indicate that human populations under severe cold stress obtain large volumes more from rounder cranial shape than from differentiation by total body size.
Analysis of brain weight. II. Adult brain weight in relation to body height, weight, and surface area.
Analysis of 1,261 adult subjects, ages 25 to 80 years, showed that there is a positive relationship between the brain weight and the body dimensions and that the loss of brain mass proceeds at a slightly faster rate than loss of body mass.