I do certainly believe about the fear part of things, where people exposed to terror will then continue to fear certain things. I doubt many who lived through a train explosion use the train systems anymore.

I think they are getting a little off course here though... and I put this down to some of these doctors who want to diagnose PTSD to anyone who sprains their ankle, or gets a paper cut, because its the new in thing to have apparently. I wouldn't say the research was concrete stuff though...