The New York Times has an article about concussions adding significantly to the possiblity of PTSD in Iraq War soldiers and veterans. The researchers surmise that many neurological symptoms might be more psychologically treated, while some stress symptoms might be more physically explained.
Here’s the url: http://www.nytimes.com/2008/01/30/health/research/30cnd-brain.html?_r=1&oref=slogin