Mental abilities have also offered insigh

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Conversely, because every mental test is "contaminated" by the effects of specific mental skills, no single test measures only g. Even the scores from IQ tests--which usually combine about a dozen subtests of specific cognitive skills--contain some "impurities" that reflect those narrower skills. For most purposes, these impurities make no practical difference, and g and.

IQ can be used interchangeably. But if they phone number list need to, intelligence researchers can statistically separate the g component of IQ. The ability to isolate g has revolutionized research on general intelligence, because it has allowed investigators to show that the predictive value of mental tests derives almost entirely from this global factor rather than from the more specific aptitudes measured by intelligence tests.

In addition to quantifying individual differences, tests of t into the meaning of intelligence in everyday life. Some tests and test items are known to correlate better with g than others do. In these items the "active ingredient" that demands the exercise of g seems to be complexity. More complex tasks require more mental manipulation, and this manipulation of information--discerning similarities and inconsistencies, drawing inferences, grasping new concepts and so on--constitutes intelligence in action. Indeed, intelligence can best be described as the ability to deal with cognitive complexity.