Why Childhood Smells Mean So Much

Why does the mere presence of certain scents instantly transport you back to childhood? This is because the first scent associated with an object is closely linked to a brain center called the hippocampus, which, in turn, is responsible for memory storage. Yaara Yeshurun ​​from a center in Israel concluded that the brain reserves a specific pattern of activity for memories that we first associate with the smell of something. This pairing likely originates in childhood. Phase one: presentation of objects Yaara Yeshurun ​​and her colleagues at the Weizmann Institute of Science in Rehovot showed volunteers objects such as a chair and a pencil. They chose these props because they were unlikely to have been previously associated with an odor . While these objects were being presented, the participants were exposed to an odor or a sound. An hour and a half later, they were shown the same objects accompanied by a different aroma or sound. Phase two: observing brain activity A week later, the researchers showed the objects to the volunteers again and asked them which smell or sound they associated with the objects. Meanwhile, they scanned their brains using functional magnetic resonance imaging. Results: the first fragrance, the most long-lasting and strongest one The volunteers were more likely to recall the first odor. And when they did, their brains showed a characteristic pattern of activity in the hippocampus. This pattern did not emerge when the volunteers chose the second odor or when they were exposed to music. The brain may have evolved to establish these privileged memories because it enhances our ability to sense danger. This is especially true for unpleasant odors. Rachel Herz confirms this theory. An evolutionary consequence is that the situation in which a scent is first experienced acts as a reliable source of its meaning. It is important to understand this meaning sufficiently to trigger appropriate responses to the scent in the future .