OXT and autism: In many studies, indices, such as the empathy quotient (EQ), autism-spectrum quotient (AQ), and systemizing quotient (SQ), have been used as proxies for autism (Dawson et al., 2002; Hoekstra et al., 2007; Valla et al., 2010), and oxytocin-induced prosocial behavior is correlated to these indices (Bartz et al., 2010a, 2019; Hirosawa et al., 2012; Yamasue et al., 2020).