<P> In psychology, fluid and crystallized intelligence (respectively abbreviated Gf and Gc) are factors of general intelligence, originally identified by Raymond Cattell . Concepts of fluid and crystallized intelligence were further developed by Cattell's student John L. Horn . </P> <P> Fluid intelligence or fluid reasoning is the capacity to reason and solve novel problems, independent of any knowledge from the past . It is the ability to analyze novel problems, identify patterns and relationships that underpin these problems and the extrapolation of these using logic . It is necessary for all logical problem solving . Fluid reasoning includes inductive reasoning and deductive reasoning . </P>

Who came up with fluid and crystallized intelligence