The idea of natural selection and “survival of the fittest” introduced by Darwin (1888), and adopted by eugenicists, relates the principles of intelligence with senses of human indefectibility, high moral standards and ethnic superi

The opposition to two factor theory of intelligence appears with the multifactor theory introduced by E.L. Thorndike. Thorndike states that there are several brain functions interacting and indicating the nature of intelligence. All these different capacities compose three types of intelligence: social, concrete and abstract intelligence (Aiken, 1987). Furthermore opposition appears through the non general group factors models proposed by Thurstone and Guilford, according to which “intelligence is not a unitary entity, but rather consists of a relatively small number of group factors” as mentioned by Aiken. Guiford’s (1967) structure- of-intellect model analyze the meaning of intelligence by figuring out parameters as the mental process, the test material and the final result of the specific mental process on a particular context. These three basic factors mentioned above, process, test material and result are broken down in five (cognition, memory, divergent thought, convergent thought and estimation), four (figural, typical, semantic and behavioral) and six (units, categories, relations, systems, transformations and implications) sub factors respectively (Aiken, 1987).

Another version of a multifactor intellectual model is Vernon’s tree-shaped hierarchical model (1969). According to this model there is a main factor on the tree and the greatest its extent the broader range of behaviors it determines. That basic factor is separated in two group factors named “verbal-educational” and “practical-mechanical-spatial”. Consecutively these two factors are divided in some more minor group sub factors as verbal fluency, numerical ability, creativity ect. An other basic analysis of the function of intelligence is between fluid intelligence gf and crystallized intelligence gc (Cattel, 1963; Horn&Cattel, 1966). A similar bisection (Hebb, 1949) of the operations o

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