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This article presents three studies, two of them longitudinal, which investigated the relations between age, processing speed, working memory (WM), and fluid intelligence (g f ) from 4 to 16years of age. Structural equation modeling showed that speed was a powerful covariate of age (~−.6 to −.7) from 4 to 13years, declining thereafter (to ~−.2). WM was stably related to speed through the whole...
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