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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.
Despite Spearman arguing that g was what emerged from a large battery of tests, i.e., that it was not measured perfectly by any single test, the fact that g-theory suggested that much of ability could be captured in a single factor, and his suggestion that "the eduction of relations and correlates" underlay this general factor led to the quest ...
Third, arguments based on Spearman's hypothesis have been criticized. Some have argued that culturally caused differences could produce a correlation between g-loadings and group differences. Flynn (2010) has criticized the basic assumption that confirmation of Spearman's hypothesis would support a partially genetic explanation for IQ differences.
Vernon preferred factor analysis for research and applied this approach to intelligence. At the top of his hierarchical model was Spearman's g and then there were two major group factors; verbal-educational ability (v:ed) and practical-spatial-mechanical abilities (k:m) which could always be
The g Factor was reviewed favorably by Canadian psychologist J. Philippe Rushton, who called it "an awesome and monumental exposition of the case for the reality of g." [3] Robert Sternberg was more critical in his review, writing that "there is a great deal of evidence of various kinds that the general factor does not do what Jensen claims."
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.
As with Cattell, Horn rejected the existence of an even higher level factor of general intelligence ‘g’ asserted by Spearman (1927). In Horn (1988) he reported a full list of such broad level abilities: g c (crystallized) g f (fluid) g v (visual) g a (auditory) q f (quantitative) g s (processing speed) TSR (Long-term storage and retrieval)
Vernon's verbal-perceptual model is a theory about the structure of intelligence proposed by Philip E. Vernon in 1964 (Vernon, 1964, 1965). [1] [2] It was influenced by the theory of g factor. [1] [2] Vernon puts emphasis on the g factor in all the mental abilities.