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"You'll probably remember exactly where you were and what you were doing when you first learned that passenger jets had crashed into the World Trade Center. People tend to form exceptionally vivid memories of highly consequential news, and it doesn't get much bigger than 9/11. Recollections of that day have given researchers a unique window into how the brain forms memories of shocking events. "It's as if a flashbulb goes off and you take a mental picture of your surroundings," says psychologist William Hirst of the New York School for Social Research. Flashbulb memories, as they are known, are tricky to study as people are seldom keen to talk to researchers just after hearing or seeing emotionally charged news. It can also be difficult to know how accurate a person's memory of the event is, since there is usually no way to be sure what actually happened. Elizabeth Phelps of New York University was in Manhattan on 9/11 and saw the attack. When fellow neuroscientist John Gabrieli called to check on her they "decided to put together a consortium of memory researchers, and started collecting data within a week"."

"Jeffrey Mitchell, a volunteer firefighter in the suburbs of Baltimore, came across the accident by chance: A car had smashed into a pickup truck loaded with metal pipes. Mitchell tried to help, but he saw at once that he was too late. The car had rear-ended the truck at high speed, sending a pipe through the windshield and into the chest of the passenger-a young bride returning home from her wedding. There was blood everywhere, staining her white dress crimson. Mitchell couldn't get the dead woman out of his mind; the tableau was stuck before his eyes. He tried to tough it out, but after months of suffering, he couldn't take it anymore. He finally told his brother, a fellow firefighter, about it. Miraculously, that worked. No more trauma; Mitchell felt free. This dramatic recovery, along with the experiences of fellow first responders, led Mitchell to do some research into recovery from trauma. He eventually concluded that he had stumbled upon a powerful treatment. In 1983, nearly a decade after the car accident, Mitchell wrote an influential paper in the Journal of Emergency Medical Services that transformed his experience into a seven-step practice, which he called critical incident stress debriefing, or CISD. The central idea: People who survive a painful event should express their feelings soon after so the memory isn't "sealed over" and repressed, which could lead to post-traumatic stress disorder. In recent years, CISD has become exceedingly popular, used by the US Department of Defense, the Federal Emergency Management Agency, the Israeli army, the United Nations, and the American Red Cross. Each year, more than 30,000 people are trained in the technique. (After the September 11 attacks, 2,000 facilitators descended on New York City.) Even though PTSD is triggered by a stressful incident, it is really a disease of memory. The problem isn't the trauma-it's that the trauma can't be forgotten. Most memories, and their associated emotion