Transience

Transience is the decreasing ability to retrieve and access memories over time. One of the "7 sins of memory" transience occurs normally with the aging process but can also occur in a very severe way as a result of brain damage. It occurs with both short and long term memories. Memories that are mundane and not detailed are more likely to not be retrieved due to transience as opposed to important or memorable events. A person is more likely to forget the plot of a movie they saw years ago than their wedding day.