Before information is stored in memory, it is first given attention, acquired, and then processed in the brain. See below to see examples.
We are able to sing along with a song, recognize a person’s face, or identify a scent due to the attention we paid to the particular event. When we attend to something, we become physically involved and this activates chemicals in the brain that assist in our ability to learn. When we associate an object with an emotion, we are more likely to remember it. This emotion can be really happy—going to prom with our high-school sweetheart, or sad—t he loss of a loved one. Some people report they can remember where they were, what they were doing, and other identifying factors when they heard the news that President John F. Kennedy was assassinated, when the Space Shuttle Challenger exploded, and/or the September 11th tragedies.
Just for fun, ask a relative if they can remember where they were when JFK was shot or how they heard about the World Trade Center buildings on September 11th.