AVP and Anxiety: In the brain, AVP serves as a neuromodulator that regulates a variety of physiological functions including social behaviors (Cilz et al., 2019; Kompier et al., 2019), learning and memory (de Wied et al., 1993; Caldwell et al., 2008), nociception (Koshimizu and Tsujimoto, 2009), circadian rhythms (Gizowski et al., 2017), and neurologic diseases such as anxiety (Caldwell et al., 2008; Neumann and Landgraf, 2012).