FOS and post-traumatic stress disorder: Contextual fear conditioning is associated with lateralized expression of c‐Fos in the BLA (Scicli, Petrovich, Swanson, & Thompson, 2004), and an imbalance between the activity of the left and the right amygdala has also been reported to be involved in the development of PTSD (Smith, Abou‐Khalil, & Zald, 2008).