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    Area of Science:

    • Psychology
    • Cognitive Science
    • Developmental Psychology

    Background:

    • Olsson and Bergman (1977) proposed a structural equation model for intellectual abilities (ages 10-13).
    • Their model identified four stable, correlated factors, each developing independently.
    • This prior model suggested intra-factor development was isolated from other factors.

    Purpose of the Study:

    • To reanalyze Olsson and Bergman's (1977) data using a different structural model.
    • To investigate the role of a second-order general intelligence factor (G) in explaining correlations among primary abilities.
    • To assess the stability of intellectual factors and the influence of G on their development.

    Main Methods:

    • Structural equation modeling reanalysis of existing longitudinal data.
    • Implementation of a hierarchical model incorporating a general intelligence factor (G).
    • Examination of factor stability over time and interdependencies in developmental trajectories.

    Main Results:

    • The general intelligence factor (G), along with verbal and spatial abilities, demonstrated stability over time.
    • The initial model's findings of broad stability were largely attributable to the stability of G.
    • Development within primary factors was significantly influenced by the development of G.

    Conclusions:

    • A hierarchical model with a general intelligence factor (G) provides a better explanation of intellectual development.
    • The stability observed in primary intellectual abilities is substantially mediated by the stability of G.
    • Developmental changes in specific cognitive skills are not independent but are closely linked to the growth of general intelligence.