The Negroid brain

The Negroid brain averages 1282 cc in volume, has a moderate degree of fissuring, and the frontal lobes are small and uncomplex.

Converting brain volume into the number of neurons, Mongoloids average more than half a billion more neurons than Negroids. (Rushton, 2000a, p. 133; Broom, 1918, p. 63-79; Howells, 1948, p. 118; Galloway, 2005, pp 31-47).

More intelligent brains show faster nerve conduction, less glucose utilization in positron emission tomography [PET scans], faster reaction times, faster inspection times, faster speeds in general, greater circumference and volume, smaller standard deviation in reaction times, greater variability in EEG [electroencephalogram] measures, shorter white matter T2 relaxation times, and higher gray-white matter contrast with magnetic resonance imaging [MRI]. (Miller, 1994d)

Africans and some retarded people have fewer convolutions ("fissures") in the cerebral cortex of their brains, where abstract thought is performed. (Broca, 1858, cited by Rushton, 2000a, p. 106). The brain of the Hottentot Venus, Fig. 26-5, and the brain of another Sanid were examined and found to have simpler sulci. (Baker, 1974, pp 319, 321; Tiedemann, 1836; Bean, 1906; Connolly, 1950, pp. 146, 203-204, 360).

Compared to Eurasians, in Africans the back of the brain is more developed and the front less developed.  (Broca, 1858, cited by Rushton, 2000a, p. 106; Bean, 1906; Levin, 1997, p. 105)

>>4
Rushton was discredited as a crank decades ago.

>>6
>two scientists have conflicting beliefs
>the one you don't like is the discredited one

>>7
If that were the case then any scientist who critiqued Lewontin would be discredited.

>>7
No, no.  Rushton is famously a crackpot, for a long time now.