Studies have demonstrated that acute and chronic stress (e.g. military training, psychological job stress, acute and repeated restraint in animals) are associated with decreased BDNF (Mitoma et al., 2008; Murakami, Imbe, Morikawa, Kubo, & Senba, 2005; Suzuki et al., 2014) and enhancement of anxiety-related behaviours (Chen et al., 2006). Here, BDNF is linked to Anxiety.