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2. Two-factor theory of intelligence - Wikipedia

   en.wikipedia.org/wiki/Two-factor_theory_of...

   Spearman's two-factor theory proposes that intelligence has two components: general intelligence ("g") and specific ability ("s"). [7] To explain the differences in performance on different tasks, Spearman hypothesized that the "s" component was specific to a certain aspect of intelligence.

3. Spearman's hypothesis - Wikipedia

   en.wikipedia.org/wiki/Spearman's_hypothesis

   When a more appropriate method of analysis, multigroup confirmatory factor analysis, is applied, it has been found that Spearman's hypothesis (i.e., that the difference is due to differences in general intelligence) is only one of several models that could give rise to the observed distributions in test scores (Dolan, 2000).

4. Charles Spearman - Wikipedia

   en.wikipedia.org/wiki/Charles_Spearman

   His ideas were in 1938 criticized on paper by psychologist Louis L. Thurstone who argued his own experiments showed that intelligence formed seven primary categories: numerical, reasoning, spatial, perceptual, memory, verbal fluency and verbal comprehension. Thurstone ultimately agreed with Spearman that there was a general factor among ability ...

5. The g Factor: The Science of Mental Ability - Wikipedia

   en.wikipedia.org/wiki/The_g_Factor:_The_Science...

   The book traces the origins of the idea of individual differences in general mental ability to 19th century researchers Herbert Spencer and Francis Galton. Charles Spearman is credited for inventing factor analysis in the early 20th century, which enabled statistical testing of the hypothesis that general mental ability is required in all mental efforts.

6. g factor (psychometrics) - Wikipedia

   en.wikipedia.org/wiki/G_factor_(psychometrics)

   The g factor [a] is a construct developed in psychometric investigations of cognitive abilities and human intelligence.It is a variable that summarizes positive correlations among different cognitive tasks, reflecting the assertion that an individual's performance on one type of cognitive task tends to be comparable to that person's performance on other kinds of cognitive tasks.

7. ELAINE HARRIS SPEARMAN COMMENTARY: It's really not that ... - AOL

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8. ELAINE HARRIS SPEARMAN COMMENTARY: Attorney general ... - AOL

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9. Heritability of IQ - Wikipedia

   en.wikipedia.org/wiki/Heritability_of_IQ

   [1] [2] Intelligence in the normal range is a polygenic trait, meaning that it is influenced by more than one gene, [3] [4] and in the case of intelligence at least 500 genes. [5] Further, explaining the similarity in IQ of closely related persons requires careful study because environmental factors may be correlated with genetic factors.