Post-traumatic stress disorder (PTSD)
PTSP is a disorder characterized by chronic physiological arousal, recurrent thoughts or images of the trauma, and avoidance of things that call the traumatic event to mind (Schacter et. al, Introducing Psychology, 2013). Many returning solders from the combat field exhibit PTSD include flashback of battle, exaggerated anxiety and startle reactions, and even medical conditions that do not arise form physical damage (e..g. paralysis or chronic fatigue). Some studies report that PTSD patients have smaller hippocampus than those without PTSD. |
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It may suggest persons with smaller hippocampus volume are more susceptible to PTSD when they are exposed to the traumatic events.
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Acute Stress Disorder (ASD)
It is a relatively newly identified disorder. Many ASD symptoms ( include nightmare, flashbacks, avoidance behavior, detachment, derealization, etc. ) are also found in PTSD patients. The main differences between ASD and PTSD are duration and occurrence of the symptoms . According to the DMS-IV, ASD is a disorder which last less than one month. It also occurs within a month after the traumatic event. Most significant ASD symptoms is avoidance of stimuli that arouse recollection of the trauma. |
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Reference:
1. Schacter, Gilbert, Wegner. Introducing Psychology second edition, Chapter 15, 2013
2. http://www.youtube.com/watch?v=tqxiEe0RH-Y
3. http://www.youtube.com/watch?v=I3Ir3xdwqWw
4. http://www.youtube.com/watch?v=IBbKOBtyA5Y&list=PLqI8aujrs6c_ksMuqmHQ5Au5JMAQimKY7
1. Schacter, Gilbert, Wegner. Introducing Psychology second edition, Chapter 15, 2013
2. http://www.youtube.com/watch?v=tqxiEe0RH-Y
3. http://www.youtube.com/watch?v=I3Ir3xdwqWw
4. http://www.youtube.com/watch?v=IBbKOBtyA5Y&list=PLqI8aujrs6c_ksMuqmHQ5Au5JMAQimKY7