A simple syllogism-solving test: empirical findings and implications for g research

摘要: It has been reported that the ability to solve syllogisms is highly g-loaded. In present study, using a self-administered shortened version of syllogism-solving test, BAROCO Short, we examined whether robust findings generated by previous research regarding IQ scores were also applicable Short scores. Five problems included in questionnaire as part postal survey conducted Keio Twin Research Center. Data collected from 487 pairs twins (1021 individuals) who Japanese junior high or school students (ages 13–18) and 536 mothers 431 fathers. Four related replicated: 1) The mean level increased gradually during adolescence, stayed unchanged 30s early 50s, subsequently declined after late 50s. 2) for both children parents predicted socioeconomic status family. 3) genetic effect increased, although shared environmental decreased progression adolescence adulthood. 4) Children's genetically correlated with achievement. These further substantiate close association between syllogistic reasoning g.