BDNF and post-traumatic stress disorder: In mammalian, BDNF is critically involved in synaptic plasticity and is implicated in hippocampus‐dependent learning and memory (Bramham & Messaoudi, 2005; Hariri et al., 2003); memory abnormalities are considered a core feature of PTSD, and patients with PTSD always present with a negative memory bias relative to healthy controls (Itoh et al., 2019).