The suggestion that mental abilities consist of fluid intelligence and crystallized intelligence was made by

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Raymond Cattell and John Horn proposed the theory of fluid and crystallized intelligence in the 1960s. Binet and Simon created the first intelligence test, but did not propose this theory. Thurstone and Guilford proposed different theories of intelligence, but not fluid and crystallized intelligence. Campione and Brown are also not associated with this theory.

The Suggestion That Mental Abilities Consist of Fluid Intelligence and Crystallized