Measuring Individual Differences in Measures of Autism Spectrum Disorders

Abstract. Previous research suggests that theory of mind tasks such as the Reading the Mind in the Eyes Test (RMET) are correlated with general intelligence ( g). The present study replicated and extended this research by testing correlations between g, the RMET, and two related measures, the empathy quotient (EQ) and systematizing quotient (SQ). The RMET, EQ, and SQ were all significantly correlated with g (r = .27 with RMET; r = −.15 with EQ; r = .27 with SQ). To determine if the RMET, EQ, and SQ derive their predictive power from g, a hierarchical regression examined whether the RMET, EQ, and SQ predicted feelings toward STEM and humanities after controlling for g. The EQ and SQ continued to significantly predict feelings toward STEM (β = −.20 for EQ; β = .42 for SQ) after controlling for g, and the RMET and EQ continued to significantly predict feelings toward humanities (β = .10 for RMET; β = .20 for EQ) after controlling for g, suggesting that these measures do not entirely derive their predictive power from g.