The study was conducted in which 156 participants performed 5 memory tasks (some thought to reflect verbal working memory and some thought to reflect visuospatial working memory) and 2 tests of general fluid intelligence, and examined the relationships among verbal working memory capacity, visuospatial working memory capacity and general fluid intelligence. Confirmatory factor analysis results indicated that: verbal working memory and visuospatial working memory reflect separate but highly related constructions. Further structural equation modeling results supported the proposal that the efficiency of domain-general central executive function or controlled attention ability may indeed be a crucial underpinning of general fluid intelligence.
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