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Why do certain smells trigger memories?

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Most of us are familiar with a scent taking us back to a very specific memory or reminding us of something or someone. Olfaction, or the sense of smell, is the sense most closely linked to memory.

But why is a scent so powerful that it can bring back memories from many years ago?

A new study is the first to explain, in neurobiological terms, how the brain allows smells to trigger such memories.

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