Who was the theorist who first described fluid and crystallised intelligence?

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Raymond Cattell was a psychologist who first described the concepts of fluid and crystallised intelligence in the 1960s. He believed that intelligence was made up of two distinct components: fluid intelligence, which refers to the ability to process information and solve problems in new situations, and crystallised intelligence, which refers to the accumulation of knowledge and skills through experience and education.

Who Was the Theorist Who First Described Fluid and Crystallised