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.

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).