General intelligence factor
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.
- Carroll J.B. 1993. Human cognitive abilities. Cambridge University Press.
- Carroll, John B. 1998. Human cognitive abilities: a critique. In McArdle, John J. & Woodcock, Richard W. Human cognitive abilities in theory and practice. Mahwah NJ: Lawrence Erlbaum, pp. 5–23. ISBN 978-0-8058-2717-0
- [https://www.webcitation.org/685dQ78Wr?url=http://www.lrainc.com/swtaboo/taboos/apa_01.html Archived 2012-06-01 at WebCite Stalking the Wild Taboo -APA Statement on The Bell Curve - Intelligence: knowns and unknowns.