Is empathizing in the E-S theory similar to agreeableness? The relationship between the EQ and SQ and major personality domains

This study investigated the relationship between the Empathy Quotient (EQ) and Systemizing Quotient (SQ) and major personality domains (Neuroticism, Extraversion, Openness to Experience, Agreeableness, Conscientiousness, and Honesty-Humility) using two personality questionnaires: the NEO-FFI and the HEXACO-PI. Participants who responded were 1382 university students for the NEO-FFI, and 842 for the HEXACO-PI, with the EQ and SQ. The results showed almost no relationship between the EQ and SQ and the five-factor personality domains of the NEO-FFI. The regression analysis showed that the NEO-FFI explained only 2-3% of the variance of the EQ/SQ, while in the domains of the HEXACO-PI extraversion moderately correlated with the EQ (r = 0.32) and openness showed the highest correlation with the SQ (r = 0.44). The regression analysis showed that the HEXACO-PI explained 22% of the variance of the EQ and 28% of the variance of the SQ. The strong relationship between the EQ and agreeableness, which was reported as r = 0.75 by Nettle (2007), was hardly found in the results of the NEO-FFI (r = 0.16) and HEXACO-PI (r = 0.17). These results suggest that that empathizing and systemizing, as one-dimensional constructs, are not substantially related to personality, although some weak relationship might be observed between the EQ/SQ and some personality domains.