![]() conducted seminal work in applied linguistics.influential in the application of factor analysis to study cognitive abilities.It specifies what kinds of individual differences in cognitive abilities exist and how those kinds of individual differences are related to one another.It proposes that there are a fairly large number of distinct individual differences in cognitive ability, and that the relationships among them can be derived by classifying them into three different strata: stratum I, 'narrow' abilities stratum II, 'broad abilities and stratum III, consisting of a single 'general' ability (Carroll, 1997, p. "The three-stratum theory of cognitive abilities is an expansion and extension of previous theories. University of North Carolina, Chapel Hill Professor of Psychology, Emeritus (1982-2003). ![]() Thurstone Psychometric Laboratory (1974-1979) Professor of Psychology and Director of the L.L.
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