AVP and Anxiety: Because AVP typically enhances (Landgraf et al., 1995; Beiderbeck et al., 2007) while OXT reduces (Windle et al., 1997; Ring et al., 2006; Blume et al., 2008) anxiety-like behaviors of rats exposed to novel environments, we predicted that AVP would reduce social play while OXT would increase social play in the novel cage.