OXT and schizophrenia: In schizophrenia, studies have shown associations between reduced serum levels of oxytocin and difficulties in facial emotion identification (Goldman et al., 2008), reduced plasma levels of oxytocin among patients during trust-dependent interactions with others (Kéri et al., 2009), as well as negative associations between oxytocin levels and severity of psychotic psychopathology (Rubin et al., 2010).