QUOTE : After any highly stressful event, such as an automobile accident, it is normal for memories, emotions, and sensations associated with the trauma to flood involuntarily into consciousness. In most cases, people replay these memories over and over again, and this "replay" mechanism actually helps defuse their emotional content and allows people to put the experience behind them. This kind of mental processing is healthy and does not lead to long-term problems. But events that are extremely traumatic—being caught in a hurricane, attacked in a war, being the victim of an assault or a rape, or having suffered severe abuse as a child—are not effectively processed by some people. When images or memories of the event return, they are not able to think about them analytically or dispassionately, but instead they reexperience the terror all over again. These intrusive thoughts do not fade with time but are persistent, and each time they occur they are newly traumatizing. Such people are haunted by nightmares, flashbacks, and feelings of anxiety, fear, and foreboding that make them experience the trauma not as a painful event of the past but as a real, in-the-present, on-going threat. As a result, their entire stress-response system, in body and mind, becomes stuck in a state of constant alert, but the state tends to be unstable. Their emotions tend to swing from one extreme to its opposite. To cope with such emotional overload, these people organize their lives around avoiding any reminder of the trauma and the feelings it invokes. It is ultimately a futile struggle, however—like fighting an invisible enemy. The battle for control sets off a vicious cycle of intrusive thoughts that produce fear and anxiety followed by desperate attempts to achieve psychological numbing to reduce the anxiety. They progressively lose the ability to control or modulate their physiological response to any kind of stressor, and stimuli completely unrelated to the trauma may trigger intrusive memories. Lit up like a pinball machine, all their internal bells and whistles blaring, they cannot articulate how they feel because they cannot decipher the messages that their nervous system is sending them. Eventually, just having a feeling, any feeling, can seem enormously threatening.