Those who score above average on tests of mathematical aptitude are also likely to score above average on tests of verbal aptitude. According to Spearman, this best illustrates the importance of

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Spearman's theory of general intelligence posits that intelligence is made up of a general factor (g) that underlies specific ability in various areas such as verbal and mathematical aptitude. Therefore, according to this theory, those who score high on one type of aptitude test are likely to score high on other types of aptitude tests due to their level of general intellectual ability.

Those Who Score Above Average on Tests of Mathematical Aptitude