IQ scores have been shown to be associated with such factors as morbidity and mortality, parental social status, and, to a substantial degree, biological parental IQ. While the heritability of IQ has been investigated for nearly a century, there is still debate about the significance of heritability estimates and the mechanisms of inheritance. History Early history The English statistician Francis Galton made the first attempt at creating a standardised test for rating a person's intelligence. French psychologist Alfred Binet, together with Victor Henri and Théodore Simon had more success in 1905, when they published the Binet-Simon test in 1905, which focused on verbal abilities. The score on the Binet-Simon scale would reveal the child's mental age. General factor (g) The many different kinds of IQ tests use a wide variety of methods. An illustration of Spearman's two-factor intelligence theory. The War Years in the United States L.L. John B.
Related: Intelligence Forms
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