There are countless strategies to sharpen your mind—regular exercise and picking up new skills are just a few. But what if you could actually increase the size of your brain?
A recent study suggests that the right fragrance might do just that. Researchers from Kyoto University and the University of Tsukuba in Japan found that wearing a specific rose-scented oil could expand gray matter in the brain.
In the experiment, 28 women wore clothing infused with the rose fragrance daily for a month, while a control group of 22 women used plain water instead.
MRI scans revealed that those exposed to the rose scent showed a measurable increase in gray matter volume.
Brain Growth May Offer Hope Against Dementia
Although bigger brain volume doesn’t automatically equal sharper cognition, the discovery could hold promise for conditions like dementia and other neurodegenerative diseases.
“The findings provide the first evidence that prolonged exposure to a scent can alter brain structure,” the researchers noted in their publication.
While previous studies have linked certain aromas to improved memory and cognitive function, this team aimed to explore the longer-term effects—specifically, whether stimulating the sense of smell could produce detectable changes in the brain’s physical makeup.
Although overall gray matter increased, the changes weren’t uniform across the brain. The amygdala, which processes emotions, and the orbitofrontal cortex, which interprets pleasant scents, changed very little. By contrast, the posterior cingulate cortex (PCC), which links memories and experiences, significantly increased its gray matter.
Olfactory Decline Shifts Activity from Amygdala to PCC
Earlier research shows that when the sense of smell weakens, the amygdala (directly tied to odors) reduces its activity, while the PCC (indirectly linked to smell) heightens its activity—suggesting the brain compensates for the loss.
The scientists propose a similar mechanism here: since the rose scent was constantly present, the amygdala no longer needed to repeatedly signal its detection. Instead, the PCC had to continuously process the stimulus and encode it into memory.
“The PCC is engaged in forming and retrieving odor-related memories, as well as in semantic memory,” the researchers explained. “In this case, the PCC showed greater activation than the amygdala, which primarily detects odors.”
Still, the exact reason behind the gray matter boost remains uncertain. Another explanation the team raised is that the brain may subconsciously categorize the rose scent as unpleasant, prompting emotional regulation processes that push the PCC to work harder and, in turn, expand.
Aromatherapy as a Simple Tool for Brain Health
The team believes their findings could pave the way for aromatherapy approaches that enhance mental health and support brain plasticity. Infusing clothing with fragrance—similar to wearing perfume or aftershave—could offer a simple and inexpensive method to promote brain health.
With larger studies and testing across different scents, this line of research may even help lower the risk of dementia in the future.
Since the PCC is known to shrink in individuals with Alzheimer’s disease, keeping it engaged through scent exposure might help preserve its activity and function.
“As such, our results indicate that continuous inhalation of rose essential oil may help prevent brain atrophy and reduce the risk of dementia,” the researchers wrote.
The study was published in Brain Research Bulletin.
Read the original article on: Science Alert
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