Race, Evolution, and Behaviour (J. Philippe Rushton)
Phil Rushton here continuing the
race thread --
- Although African Americans,
who average about 20% White genes, have IQs averaging about 85, Africans
from Africa average IQs of about 70. See reviews
of this literature in The Bell Curve or my book
- East Asians average IQs on
the same Euro-American designed tests of about 107 regardless of whether
tested in the U.S. or
- Brain size correlates about
0.44 with IQ tests established using Magnetic Resonance Imaging (about 8
- The racial populations differ
in average brain size with East Asians averaging about 17cm3 (1 cubic
inch) larger than Whites who average about 80 cm3 (5 cubic inches) larger
than Blacks (established by autopsies, endocranial
volume, external head size measures, and one MRI study).
- In the USA, brain
size differences are there at birth, 4 months, 1 year, and 7 years. The
differences are not due to body size because by age 7 Blacks are taller
and heavier and East Asians shorter and lighter, than Whites (on average).
- Testosterone differences
differentiate the races (Blacks most; Asians least; Whites intermediate).
- Violent crime rates within
are the same as those found internationally as assessed from INTERPOL
Yearbooks (Blacks most violent; Asians least violent; Whites
- Sexual activity (age at first
intercourse, intercourse frequency, sexually transmitted diseases,
including AIDS) shows the same pattern internationally as it does within
(Blacks most active, Asians least active, Whites intermediate).
- Speed of physical maturation
(dentition, age to walk, age of puberty) shows the same pattern globally
as it does within the USA
(Blacks fastest to mature; East Asians slowest to mature; Whites
- Rate of dizygotic
twinning (woman produces two eggs in monthly cycle) is 4 per 1,000 births
in Asians, 8 per 1,000 in Whites, and 16 per 1,000 in Africans.
THESE ARE FACTS. THEIR EXPLANATION REQUIRES THOUGHT.
Can purely cultural factors account for the world wide pattern? Why do east Asians avergae the largest
brains and the lowest two-egg twinning rate, Afriocans
the smallest brains and the highest two-egg twinning rate, and Whites
My book uses r-K life history theory from evolutionary biology to explain
the race differences. Alternative theories welcome. Name calling won't change
Link to book source