n. a theory which proposes that general intelligence can be divided into two broad sets of abilities, namely: (1) G-f, or fluid ability which is the physiological efficiency with which a person deals with novel tasks, solves problems, and takes charge of short-term memories, and (2) G-c, or crystallized ability which is the learned and acquired aspect of mental ability as seen in one's knowledge of language, vocabulary, and general information. Proposed by Raymond Cattell and John Horn in the 1960s.
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