In this article, it is argued that it makes sense to define and distinguish three levels of human intelligence: intelligence as genotypical potential, intelligence as actualised in environmental interaction, and intelligence as measured by tests (IQ). This raises the questions of what is meant by the term "intelligence as potential", and…

Lewis M. Terman's "Genetic Studies of Genius" stands as one of the landmark studies of the 20th century in the educational and psychological sciences. This longitudinal study of individuals in the top 1% of general cognitive ability has sparked interest and debate among scholars for nearly 100 years. In this study, we examine how…

Crude and dangerous ideas about the genetic heritability of intelligence, and a supposed biological basis for the Black/White achievement gap, are alive and well inside the education policy process but taking new and more subtle forms. Drawing on Critical Race Theory, the paper analyses recent hereditarian writing, in the UK and the USA, and…

In this paper we assess the presence of assortative mating, gene-environment interaction and the heritability of intelligence in childhood using a twin family design with twins, their siblings and parents from 112 families. We evaluate two competing hypotheses about the cause of assortative mating in intelligence: social homogamy and phenotypic…

Background: The aim of this study was to assess the validity of diagnosing attention deficit/hyperactivity disorder (ADHD) in high IQ children and to further characterize the clinical features associated with their ADHD. Methods: We operationalized giftedness/high IQ as having a full scale IQ greater than or equal to 120. We identified 92 children…

The relation between intelligence and birth order was shown in a recent publication [Bjerkedal, T., Kristensen, P., Skjeret, G. A. & Brevik, J. I. (2007). Intelligence test scores and birth order among young Norwegian men (conscripts) analyzed within and between families. "Intelligence," 35, 503-514] to be negative. Subjects in this…

Critiques Arthur Jensen's concept of a "reality principle" in educational research from the March 1984 "Phi Delta Kappan." Emphasizes that objectivity and ideology are complementary, not contradictory, aspects of educators' work. (MD)

Dissects the controversial Jensen paper, and concludes that Jensen is wrong. (DM)

Geneticists discuss the Jensen paper and suggest upon reviewing the evidence, that the question of genetic differences between the IQ of blacks and whites cannot be answered in the present circumstances. (DM)

Used the classical twin design with 390 pairs of twins to study the influence of genetic factors on the large phenotypic variation in inspection time (IT) and whether the well-established IT-IQ association could be explained by a common genetic factor. Findings provide potentially important information for the biological bases of the…

Attempts to show that the purportedly scientific'' empirical basis of credentialism and I.Q.-ism'' is false; and to facilitate linkages between the groups who are being discriminated against the workers' movements within the white male labor force, by showing that the same mechanisms are used to divide strata against one another so as to…

The author suggests that more empirical evidence will have to be found before environmental influence can be declared insufficient to the cause of Negro-White I.Q. score differences. (Editor/RT)

Although most discussions today start from the assumption that the secular rise in IQ must be environmental in origin, three reasons warrant giving the genetic phenomenon heterosis a closer look as a potential cause. First, it easily accounts for both the high heritability and low shared environmental effects seen in IQ, findings that are…