Unfortunately while studying the brain you cannot usually cut your subject open to check if you caused the results intended.
It is known that we retain what the brains decide is important. One criteria appears to be repetition. If we focus over and over on something our brain will think it is important and will remember it and store it permanently overnight.
By playing an intense concentration game immediately after a traumatic event would likely be effective at keeping you from repeating the events and pictures in your mind and therefore help you to forget the intensity of the feelings you had. What a marvelous tool we have. Too bad so many don't know how to use it???
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