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Military experiment seeks to predict PTSD (AP)

This Sept. 29, 2009 photo shows U.S. Marine Pfc. Jesse Sheets, of Newark, Del., sitting in an eye blink study room with sensors attached to his face while taking psychological tests at the Marine Corps Air Ground Combat Center in Twentynine Palms, Calif. The U.S. government is testing hundreds of Marines and soldiers before they ship out, in search of clues that might help predict who is most susceptible to post-traumatic stress disorder. (AP Photo/Jae C. Hong)AP - Two days before shipping off to war, Marine Pfc. Jesse Sheets sat inside a trailer in the Mojave Desert, his gaze fixed on a computer that flashed a rhythmic pulse of contrasting images.