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The differentiation hypothesis and the Flynn effect

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Issue date
2006
Author
Juan-Espinosa, Manuel
Cuevas Esteban, Lara
Escorial Martín, Sergio
García Rodríguez, Luis Francisco
Suggested citation
Juan-Espinosa, Manuel; Cuevas Esteban, Lara; Escorial Martín, Sergio; García Rodríguez, Luis Francisco; . (2006) . The differentiation hypothesis and the Flynn effect. Psicothema, 2006, vol. 18, núm. 2, p. 284-287. http://hdl.handle.net/10459.1/41563.
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Abstract
Many studies have shown that IQs have been increasing over the last half century. These increases have come to be known as «the Flynn effect». The «Flynn effect» represents a difference on ability-level between groups of the same age but different cohort. The ability-level differentiation hypothesis represents a difference on the relevance of cognitive factors between groups of high and low ability. Hence, it should be possible to imitate the ability-level differentiation effect by comparing groups of the same age but different cohort. The indifferentiation hypothesis represents no differences on the relevance of cognitive abilities in all age groups within the same cohort. The aim of the present study is to test the relationships between these phenomena. For this purpose we analyzed the American standardisation samples of the WISC, WISC-R and WISC-III. Results support the link between the Flynn effect and the differentiation hypothesis. Also, reported evidence replicate previous findings supporting the indifferentiation hypothesis. Implications for the assessment of the intelligence are discussed.
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http://hdl.handle.net/10459.1/41563
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Psicothema, 2006, vol. 18, núm. 2, p. 284-287
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