Journal Alert - INTELLIGENCE

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 16 years of age. > Structural equation modeling showed that speed was a powerful covariate > of age (similar to-.6 to -.7) from 4 to 13 years, declining thereafter > (to similar to-.2). WM was stably related to speed through the whole > age-span studied (similar to-.4 to -.5). A large part (59%) of > age-related changes in gf (83%) from 4 to 7 years and a lower but > significant part later on, especially in adolescence (similar to 10-20% > out of similar to 40-50%), were mediated by WM. However, with speed and > age controlled, WM was almost fully commensurate with g(f)(similar > to-.9), from about the age of 8-9 years onwards. A series of models > suggested an ever present efficiency level defined by speed and control > and a representational level defined by WM and g(f), which are > increasingly differentiated with development. All processes develop in > cycles concerted by a dynamic G. Change in each process over time > originated from within the processes themselves and G, in proportions > varying with developmental phase. Overall, speed signified > age-associated changes in processing capabilities, partly expressed in > WM expansions and g(f) reconstructions. An overarching model is proposed > integrating differential with ...
Source: Intelligent Insights on Intelligence Theories and Tests (aka IQ's Corner) - Category: Neurologists Source Type: blogs