Both the theory of intelligence and its measurement have been confused by failure to follow a scientifically acceptable definition of intelligence. In good part, the problem arises from the folk definition of intelligence that involves the innate fixed capacity of a person to solve problems. This folk definition differs in only one important respect in its usage by environmentalists as opposed to hereditarians. The former tend to minimize the importance of individual differences in this fixed capacity, holding that any normal person has the fundamental capacity to achieve at a high level. Environmentalists are also strongly convinced that intelligence tests do not measure this capacity.
KeywordsGeneral Factor Latent Trait Assortative Mating Behavioral Trait Achievement Test
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