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Initial Association Of A Smell Will Leave A Unique And Lasting Impression In The Brain
According to graduate student Yaara Yeshurun, along with Profs. Noam Sobel and Yadin Dudai of the Institute's Neurobiology Department, the key might not necessarily lie in childhood, but rather in the first time a smell is encountered in the context of a particular object or event.
In other words, the initial association of a smell with an experience will somehow leave a unique and lasting impression in the brain.
For the study, scientists devised an experiment, in which they first made the subjects in a special smell laboratory to view images of 60 visual objects, each presented simultaneously with either a pleasant or an unpleasant odor generated in a machine called an olfactometer.
Next, the subjects were put in an fMRI scanner to measure their brain activity as they reviewed the images they'd seen and attempted to remember which odor was associated with each.
The test was repeated with the same images, but different odors accompanying each.
After one week the subjects were scanned in the fMRI again. They viewed the objects one more time and were asked to recall the odors they associated with them.
The scientists found that after one week, even if the subject recalled both odors equally, the first association revealed a distinctive pattern of brain activity.
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