General intelligence factor facts for kids
Charles Spearman, an early statistician and psychologist, found that school children's grades across unrelated subjects were strongly related to each other. That is to say, children who were good at one area (such as reading) were also good in another area (such as math). He then proposed that these relationships reflected the influence of a dominant factor, which he called g for "general" intelligence. He developed a model where all variation in intelligence test scores can be explained by two factors. The first is the factor specific to an individual mental task: the individual abilities that would make a person more skilled at one cognitive task than another. The second is g, a general factor that governs performance on all cognitive tasks.
After 120 years of cognitive testing, gs central role is still a meaningful measure. Other models have also been proposed, and there is significant controversy about g and its alternatives.
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An illustration of John B. Carroll's three stratum theory, an influential contemporary model of cognitive abilities. The broad abilities recognized by the model are fluid intelligence (Gf), crystallized intelligence (Gc), general memory and learning (Gy), broad visual perception (Gv), broad auditory perception (Gu), broad retrieval ability (Gr), broad cognitive speediness (Gs), and processing speed (Gt). Carroll regarded the broad abilities as different "flavors" of g.
General intelligence factor Facts for Kids. Kiddle Encyclopedia.