In their review on ‘the role of oxytocin in psychiatric disorders’, Cochran et al. (2013) highlighted three lines of investigation on which studies into the social effects of OXT have focused: (1) studies of endogenous peripheral (blood plasma, urinary and salivary) and/or central (cerobrospinal fluid [CSF]) OXT levels, (2) genetic studies and (3) exogenous OXT administration studies. The gene discussed is OXT; the disease is psychiatric disorder.