Responds to an earlier article by William Darity, Jr., which criticized the author's concept of equal economic opportunity. Claims that Darity misrepresented his viewpoint regarding racial differences in economic status. (GC)

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)

Discusses Jensen's research and writings on genetic v environmental determinants of intelligence. Reviews professional response to his 1969 "Harvard Educational Review" article, and briefly considers the work of other researchers on the relationship between race and intelligence. (GC)

Discusses R. Herrnstein's and C. Murray's attempt to persuade an educated white readership that they, the readers, are genetically, socially, and intellectually superior. The most effective criticisms are those that rely on scientific evidence about the manipulation of data and flawed analyses rather than the display of moral outrage. (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)

Answers Sowell's charge that his work was misrepresented in an earlier article by Darity. Discusses Sowell's position on the relationship between culture and economic accomplishment, equality in the labor market, and the role of competition in the economic marketplace.(GC)

Hypothesizes that a child's realization of genetic potential for intellectual development depends on socioeconomic environment. Peabody Picture Vocabulary Test results were examined for a large sibling sample of African American and White adolescents from the National Longitudinal Study of Adolescent Health. When SES factors were considered…

In "The End of Racism" Dinesh D'Souza proposes a theory of rational discrimination based on the recognition that there are vast civilizational differences between black and white Americans and states a case for the repeal of the Civil Rights Act because it actually harms black prospects. (SLD)

Michael Levin argues that data from the study are consistent with a black/white IQ difference that is significantly genetic. Richard Lynn maintains that adoption by middle-class, white families has no effect on intelligence. Waldman, Weinberg, and Scarr respond to these criticisms and support the original conclusions. (SLD)

An analysis of intelligence quotient (IQ) in relation to head size was performed on about 14,000 children aged 4 and 7 years, almost equally divided by race (white and black) and sex. Correlation between head size (by inference, brain size), and IQ is established as a within-families correlation. (SLD)

Data used to support Spearman's hypothesis have been incorrectly and inconsistently reported and do not support the claim that African-American-white differences in intelligence are not environmental in origin. Deaf children should not be considered a single population with respect to linguistic deprivation. (SLD)

In 1969, Arthur Jensen published his controversial article concluding that blacks are less intelligent than whites and that genetic factors explain more of the variance between the two groups than environmental differences. This paper criticizes Jensen's work and discusses its negative implications. Interpretive and methodological weaknesses in…

Wechsler Preschool and Primary Scale of Intelligence (WPPSI) and McCarthy Scales subtests were ranked according to relative reliance on left-cerebral-hemisphere function. Results suggest that black-white IQ discrepancies may be partially explained by differences in hemisphericity. (Author/RD)

Although there continues to be controversy about the magnitude of genetic and environmental effects on human behavior, it is generally agreed by various scientific fields that individual differences in brain function and behavior must follow the same laws of variability as other human characteristics. Whether or not racial and ethnic group…

"The Bell Curve" by Richard J. Herrnstein and Charles A. Murray has ignited a fierce academic debate. They assert that IQ as measured by tests has replaced family wealth and status in determining jobs, income, class, and place in American life; that whites average 15 IQ points higher than blacks; and that high-IQ ruling elites, with…