In 1904, Thurstone and Thurstone proposed the idea that intelligence is comprised of one overarching factor, g, which is responsible for performance on all mental tests.

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The idea of a single general intelligence factor, g, was proposed by Charles Spearman, not Thurstone and Thurstone. Thurstone actually argued against this idea, proposing instead that intelligence is made up of multiple primary mental abilities.

In 1904, Thurstone and Thurstone Proposed the Idea That Intelligence