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research on posttraumatic stress disorder (PTSD) has been based on widely held... unproven assumptions/the 1st of these is that the initial response to the trauma, which eventually leads to PTSD, is a normal response to an abnormal event/another assumption is that continuity—namely, that the reaction that takes place immediately after a trauma continues in some way into the chronic PTSD/lastly, it is often assumed that there is an analogy between traumatic stress and milder forms of stress/challenges these concepts by examining the available literature/proposes a model that attempts to explain the perseverance of PTSD symptoms