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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"."

"Recall a time you said or did something incorrect in front of peers or authority figures. Now think of all the details you can recall associated with that experience. Where you were, who was there, any other things you wouldn't ordinarily remember about distant events such as what you wore, saw, did earlier or later that day. If you have a minute, write down some of these ancillary sensory memories. What you recall now is the result of your dopamine-reward network and your flashbulb memory or event memory system. As the brain evolved for survival of the animal and the species, much of what we humans now do is directed by hard-wired neural networks and neurotransmitters not under conscious control. Actually only about 17% of your brain is capable of responding to your conscious will; the rest is pretty much like that of a lower mammal or newborn baby with reactions to input based on association with imminent danger, risk, or pleasure."

"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

"Despite memory's obvious benefits, it can also let us down, said Daniel Schacter, PhD, longtime memory researcher and chair of Harvard University's psychology department, at an APA 2003 Annual Convention session honoring the publication of his book, "The Seven Sins of Memory: How the Mind Forgets and Remembers" (Houghton Mifflin, 2001). "Memory, for all that it does for us every day...for all the feats that can sometimes amaze us, can also be a troublemaker," said Schacter of his book, which describes the seven major categories of memory foibles being investigated by psychologists. However, noted Schacter, the same brain mechanisms account for memory's sins as well as its strengths, so investigating its negatives exposes its positives. "We shouldn't think of these fundamentally as flaws in the architecture of memory," he explained, "but rather as costs we pay for benefits in memory that make it work as well as it does most of the time." At the session, during which Schacter received the APA Div. 1 (Society for General Psychology) William James Book Award, he defined his book's seven sins. The first three are "sins of omission" that involve forgetting, and the second four are "sins of commission" that involve distorted or unwanted recollections."