OXT and Anxiety: Neuropeptides, like arginine vasopressin and oxytocin, have been shown to be important regulators of inter-male, female and maternal aggression (Ferris, 2005; Neumann and Landgraf, 2012; Calcagnoli et al., 2013; De Jong et al., 2013), but are also part of neuronal circuits regulating anxiety in rats and mice (Landgraf et al., 1995; McCarthy et al., 1996; Bielsky et al., 2005; Blume et al., 2008).