“…They can vary from relatively mild (there is a transient sense of the event reoccurring in the present) to extreme (the person loses all connection with their current autobiographical self and present surroundings while reexperiencing the memory). An emerging literature documents that flashbacks are specific to PTSD rather than mere trauma exposure (Brewin, 2007), that they distinguish PTSD from depression (Reynolds & Brewin, 1998) and that, relative to intrusive memories in depression, intrusive memories in PTSD involve a greater sense of reliving in the present (Birrer et al, 2007). Flashbacks appear to be a particularly sensitive and specific indicator of PTSD (Duke, Allen, Rozee, & Bommaritto, 2008), and their characteristic features are predictive of the course of the disorder (Michael, Ehlers, Halligan, & Clark, 2005).…”