Who is John Horn and what was his theory about?

Among the several theories of intelligence, the Cattell-Horn theory of intelligence is considered one of the most important theories in the field of studying human intelligence. The theory was proposed by Raymond Cattell in 1963 and the theory was further developed with John Horn. Fluid intelligence The ability to handle novel tasks, and solve problems through abstract thinking and logic. A person can think speedily and come up with solutions for new problems without relying on past experience, and knowledge acquired. Crystallized intelligence It is the use of the knowledge gained previously which can be seen in one's language, vocabulary, and general information. It involves the recalling of information and skills acquired previously. The older a person gets, he/she acquires more knowledge, and crystallized intelligence increases. Read More>> Cattell-Horn theory of intelligence