esting and unspecific time effects". (Van Wingen GA, 2011).
             The combat stress group consisted of thirty-three healthy soldiers who were deployed for four months to Afghanistan. They were recruited from a larger prospective study on the development of stress related disorders following military deployment in the Dutch armed forces. Their duties included patrolling the areas, clearing or searching homes and buildings, participating in demining operations and transportation across enemy territory. The control groups were twenty-six soldiers who were recruited from training bases and army divisions and who were not involved in combat missions. Three questioners were used to evaluate the influence of severe stress exposure on PTSD symptoms, mood and anxiety. The short version of a previously validated Dutch questionnaire, the self-rating inventory for PTSD, was used to assess self-reported PTSD symptoms. Another was The Dutch version of the Positive and Negative Affect Schedule was used to assess positive and negative mood, and Dutch state version of the State Trait Anxiety Inventory was administered to assess state anxiety.
             The Experiment set-up was performed using a Magnetic Resonance Imaging (MRI) (Van Wingen GA, 2011). An MRI scan is a radiology technique that uses magnetism, radio waves, and a computer to produce images of body structures. The image and resolution produced by MRI is quite detailed and can detect tiny changes of structures within the body. To evaluate the influence of severe exposure to stress on PTSD symptoms, mood and anxiety, three questionnaires were used; they included the short version of a previously validated Dutch questionnaire, the self-rating inventory for PTSD, which was used to assess self-reported PTSD symptoms. (van Wingen GA, 2011). The Dutch version of the Positive and Negative Affect Schedule was used to assess positive and negative mood, and Dutch state version of the State Trait Anxiety Invent...