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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 .
The PASS theory provides the theoretical framework for a measurement instrument called the Das-Naglieri Cognitive Assessment System (CAS), published in 1997. [6] This test, now in a Second Edition (CAS2; 2014, Naglieri, Das & Gold-stein) is designed to provide an assessment of intellectual functioning redefined as four brain-based cognitive processes (Planning, Attention, Simultaneous and ...
More specifically, the theory does not explain the influence of parental nurture and social interactions on human development. Domain-specific learning is a theory in developmental psychology that says the development of one set of skills is independent from the development of other types of skills.
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."
Chief amongst these achievements was the discovery of the general factor in human intelligence, [4] and his subsequent development of a theory of "g" [8] and synthesis of empirical work on ability. [9] Spearman was strongly influenced by the work of Francis Galton.
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 ...
Piaget argued that developments in domain-general cognitive architecture drives learning and conceptual change in his theory of cognitive development. [17] Similarly, Spearman proposed an underlying, domain-general g-factor (general intelligence) to explain one's performance on all types of mental tests. [18]