g, mutualism, and development: Cross-sectional evidence from Iranian schoolchildren

Different models might explain one the most replicated findings in Psychology, namely, the positive correlation among diverse tests of cognitive ability (positive manifold). The g factor and the mutualism models are examples. Mutualism suggests that the manifold emerges progressively during development, as a consequence of interactions among originally uncorrelated cognitive process. The g factor model departs from this perspective and assumes...