Adding to the previous answer, there is also another very interesting aspect of Psychology in play. Every time a person remembers something, they are not really remembering the 'event' itself, but they're actually remembering the last time they remembered the event. And each time we do so, we manipulate and change the memory a little bit. Therefore in the long run, it's like your brain playing 'Ch... more

A lot of this has to do with the idea of eye-witness testimony. Within psychology, much research has been done within crime scenes and how well witnesses recall situations. A study looked upon by researchers Yuille and Cutshall in the 1900s interviewed a number of witnesses to a real life shooting, showing that those who had more expression of anxiety, the better their testimony was. There has bee... more