colleagues (1997, September) note, "Recent studies suggest that PTSD and depression may have diametrically opposite neurobiology" (p. 1242). The PTSD response to trauma is active avoidance, while depression is often passive avoidance of the source of psychological pain.
Pinkowish (1999, October 15) writes, "PTSD is considered among the most common of psychiatric disorders and affects all segments of the population" (p. 171). The DSM-IV (1994) estimates that, among all populations, PTSD is likely to occur between 1 percent and 14 percent of the time, an incredibly wide range. The manual suggests that this "variability [is] related to methods of ascertainment and the population sampled" (p. 426); it may be as much an indication of the relative newness of the disorder as a distinct diagnosis as an accurate indication of how likely PTSD is to occur in the general population.
Among populations who are at risk of exposure to traumatic events, such as military veterans and survivors of natural disasters, the DSM-IV (1994) estimates
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