Whether it is the whiff of a woman’s perfume that takes your mind back to an ex-girlfriend, or a song that defines a moment in your life, the strong connection between senses and memory has long intrigued scientists.

However, a study has found that when we smell or hear something during an emotional experience, the odour or sound is woven together with the memory in the same region of the brain.

— From Smells linked to memories 'because they are stored in same part of brain' at the Telegraph. Many thanks to Ruth for the link!