Data from 236 pairs of black twins and white twins aged 13-17 years were used to examine genetic and environmental factors influencing cranial size, an indirect estimate of brain volume. Genetic factors are required to account for the phenotypic variance in cranial capacity. (SLD)

Comments on the work of Arthur Jensen, specifically "The g Factor" (1998), which consolidates the psychometric, neurophysiological, behavior genetic, and comparative evidence for the existence and importance of a factor of general intelligence ("g"). Discusses Jensen's work on black/white differences in intelligence. (SLD)

Reviews the controversy surrounding the work of Cyril Burt on the genetic contribution to mental ability and argues that the disparagement of Burt's results provides one of the most extraordinary cases of counterfeit charges in academic psychology. Suggesting genetic differences in brain size or intellect is politically incorrect. (SLD)

Genetic influence was estimated on Wechsler Intelligence Scale for Children subtests from inbreeding depression scores calculated on cousin marriages in Japan (n=1,854 children) and correlated with American Black-White racial differences. The genetic contribution of racial differences in cognitive performance may be more robust than was previously…

The egalitarian dogma, the belief that blacks and whites are genetically equal in cognitive ability, has been perpetuated through intimidation and pious thinking. Data on racial differences and the corruption of scholarship that causes them to be ignored are discussed. (SLD)