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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.
Spearman's hypothesis has often been taken to imply natural differences in Black-White general intelligence, a conclusion that is rejected by a strong consensus within the scientific community. [ 9 ] [ 10 ] [ 11 ] It has been used to justify pseudo-scientific racist theories .
Spearman applied mathematical procedures to psychological phenomena and moulded the outcome of his analysis into a theory – which has greatly influenced modern psychology. [11] Factor analysis and its modern relations confirmatory factor analysis and structural equation modelling underlie much of modern behaviour research.
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.
An influential theory that promoted the idea that IQ measures a fundamental quality possessed by every person is the theory of General Intelligence, or g factor. [27] The g factor is a construct that summarizes the correlations observed between an individual's scores on a range of cognitive tests.
Charles Spearman, who coined the general intelligence factor "g", described intelligence as one's ability to adapt to his environment with a set of useful skills including reasoning and understanding patterns and relationships. He believed individuals highly developed in one intellectual ability tended to be highly developed at other ...
Contemporary theories about intelligence can be divided into two classes: psychometric and cognitive. The quantitative approach to intelligence is better reflected in psychometric theories of which Charles Spearman's is an early example. In contrast, cognitive theories such as PASS theory are both qualitative and quantitative.
The Cattell–Horn–Carroll theory is an integration of two previously established theoretical models of intelligence: the theory of fluid and crystallized intelligence (Gf-Gc) (Cattell, 1941; Horn 1965), and Carroll's three-stratum theory (1993), a hierarchical, three-stratum model of intelligence. Due to substantial similarities between the ...