Aspects of this topic are discussed in the following places at Britannica.
British psychologist who theorized that a general factor of intelligence, g, is present in varying degrees in different human abilities.
...He concluded that just two kinds of factors underlie all individual differences in test scores. The first and more important factor, which he labeled the “general factor,” or g, pervades performance on all tasks requiring intelligence. In other words, regardless of the task, if it requires intelligence, it requires g. The second factor is specifically...
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