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Biologically, this happens because two important parts of the brain work together. The hippocampus is responsible for storing and retrieving memories, while the amygdala stores the emotions we felt during those moments. So when we hear an old song, both of these areas activate at the same time. Tha…

Biologically, this happens because two important parts of the brain work together. The hippocampus is responsible for storing and retrieving memories, while the amygdala stores the emotions we felt during those moments. So when we hear an old song, both of these areas activate at the same time. That’s why we don’t just remember what happened—we actually feel the emotions again.