Facts about G Factor (General Intelligence)
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Fluid intelligence, which closely reflects g, tends to peak in early adulthood and declines with age, while crystallized intelligence remains more stable.
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Higher g factor scores are associated with real-world outcomes including academic achievement, job performance, and even health and longevity.
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In psychometric research, g factor accounts for a substantial portion of the variance across diverse cognitive tasks, making it the strongest predictor of general mental ability.
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Positive correlations among all cognitive ability tests, a phenomenon called the positive manifold, provide the empirical foundation for g factor theory.
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The g factor was first identified by British psychologist Charles Spearman in 1904 through his work on correlations between mental ability tests.