We investigated Gardner's "Theory of Multiple Intelligences" in a sample of 200 adults. For each of the hypothesized eight "intelligence" domains--Linguistic, Logical/Mathematical, Spatial, Interpersonal, Intrapersonal, Musical, Bodily-Kinesthetic, Naturalistic--we selected two tests based on Gardner's description of its content. Factor analysis…

In their book, IQ and the Wealth of Nations, Lynn and Vanhanen ([Lynn, R. and Vanhanen, T. (2002). IQ and the wealth of nations. Westport, CT: Praeger.]) proposed the hypothesis that "the intelligence of the populations has been a major factor responsible for the national differences in economic growth and for the gap in per capita income between…

Spearman's "Law of Diminishing Returns" states that the g saturation of a test is greater for individuals with lower, rather than higher, test scores, and that it decreases with age. A common methodological problem in testing Spearman's "Law of Diminishing Returns" with respect to ability differentiation is how to create the…