2013), with a hormonal correlate in greatly increased levels of plasma oxytocin (Dai et al. 2012). Indeed, a wide range of the behavioral, cognitive, and neurological phenotypes of Williams syndrome closely parallel the effects of oxytocin administration to healthy individuals, for such traits as increased social approach (Kemp and Guastella 2011; Järvinen et al. 2013), trust (Zhong et al. 2012; Godbee and Porter 2013), increased gaze toward faces and eyes (Guastella et al. 2008; Porter et al. 2010), and increased empathy (Fidler et al. 2007; Hurlemann et al. 2010). The gene discussed is OXT; the disease is Williams syndrome.