![]() ![]() Hebb were critical of the ability of the currently available tests to accurately measure intelligence and both began to develop improved tests of intelligence. In the 1930s and early 1940s, both Raymond B. 179) wrote that “Hebb has independently stated very clearly what constitutes two thirds of the present theory.” This paper examines the work of Hebb and Cattell on intelligence, their correspondence, the development of the ideas of fluid and crystallized intelligence, and why Cattell ( 1943, p. Hebb and Cattell exchanged a number of letters before Cattell's paper was rewritten in such a way that everyone was satisfied. This paper describes Hebb's two types of intelligence, and shows how Cattell used them to develop his ideas of crystallized and fluid intelligence. Correspondence between Cattell, Donald Hebb and George Humphrey of Queen's University, Kingston, Ontario, however, indicates that Cattell adopted Hebb's ideas of intelligence A and B and renamed them. Carroll ( 1984, Multivariate Behavioral Research, 19, 300-306) noted the similarity of Cattell's theory to “Hebb's notion of two types of intelligence,” which was presented at the 1941 APA meeting, but the matter has been left at that. Cattell, in different papers, stated that it was developed in 1940, 1941 or 1942. ![]() ![]() The genesis of this theory is, however, vague. Cattell is credited with the development of the theory of fluid and crystallized intelligence. ![]()
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