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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 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.
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 .
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.
In psychology, human intelligence is commonly assessed by IQ ... Hebb's theory of intelligence suggested a ... Spearman found that a single common factor explained ...
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.
Educational psychology, intelligence ... This is a claim most closely identified with Charles Spearman. ... instruction, and assessment: Theory into practice ...
Intelligence theories date back to the 19th century and the early 20th century, such as Charles Spearman's concept of general intelligence factor, or g. Though there were exceptions (e.g., Thorndike), most theories of intelligence included g, a general index of cognitive ability.