Prospective Randomized Controlled Trial of the Impact of Olfactory Training on Cognitive and Emotional Function in Individuals with Parkinson Disease.
Yunxiao Dou, Siyu Qian, Yichen Zhao and 2 others
PMID 41477097WHAT IT FOUND
Six months of sniffing four scents twice daily improved memory, thinking, and mood in people with Parkinson disease.
The group doing the training scored better than controls on all these tests, though motor symptoms did not change.
Key findings
01Participants who did the olfactory training showed significant improvements in memory scores compared to the control group.
02The training group also had better scores on general cognitive tests and measures of depression and anxiety than the control group.
03Improvements in the ability to smell were positively correlated with improvements in memory, but not with other cognitive or emotional changes.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The study was single-center and had a small sample size. The control group was not blinded to the intervention, which could introduce bias in subjective outcome measures. It is unclear if the benefits persist after the six-month training period ends. The study did not measure brain structure or function to explain the mechanism of the observed effects.
Declared interests
The investigators have no financial or nonfinancial disclosures to make in relation to this project.
The easy way to misread this
Do not assume that smelling better directly causes better thinking in all domains. The study found that smell improvement correlated with memory gains, but not with changes in other cognitive or emotional scores.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →