Non-g residuals of the SAT and ACT predict specific abilities

This research examined whether non-g residuals of the SAT and ACT subtests, obtained after removing g, predicted specific abilities. Non-g residuals of the verbal and math subtests of the SAT and ACT were correlated with academic (verbal and math) and non-academic abilities (speed and shop), both based on the Armed Services Vocational Aptitude Battery. Non-g residuals of the SAT and ACT math subtests were positively related to math ability and negatively to verbal ability, whereas the opposite pattern was found for the verbal subtests. Non-g residuals of both sets of subtests were weakly related to non-academic abilities. The results support an investment theory of skills and abilities: Investing in skills in one area (e.g., math) improves abilities in that area but lowers abilities in competing areas (e.g., verbal).

► Non-g residuals of the SAT and ACT subtests predicted math and verbal abilities.
► Subtest residuals were positively related to complementary abilities.
► Subtest residuals were negatively related to non-complementary abilities.
► Subtest residuals were weakly related to non-academic abilities (e.g., shop).
► Results support an investment theory of skills and abilities.