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Updated: Aug 12, 2026
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A Free-breathing fMRI Method to Study Human Olfactory Function
Published on: July 30, 2017
A novel objective olfactory assessment method based on nasal airflow changes following eugenol stimulation
Yitao Liu1, Ruiqi Xia1, Wei Feng1
1Department of Otorhinolaryngology, Wangjing Hospital, China Academy of Chinese Medical Sciences, No. 6 Huajiadi Street, Chaoyang District, Beijing 100102, China.
Acta Oto-Laryngologica
|August 11, 2026
Summary
A new nasal airflow test offers a simple, objective way to assess smell, but shows weak links to other tests. While useful for screening, it doesn't replace detailed olfactory evaluations.
Area of Science:
- Olfactory neuroscience
- Medical diagnostics
- Biomedical engineering
Background:
- Current olfactory assessments are often subjective or overly complex.
- There is a need for simple, economical, and objective methods for evaluating smell function.
Purpose of the Study:
- To evaluate a novel nasal airflow-based olfactory assessment method.
- To determine its correlation with established olfactory tests and its diagnostic accuracy.
Main Methods:
- Four hundred and twelve participants underwent olfactory testing using visual analog scale (VAS) scoring, Sniffin' Sticks, and a nasal airflow assessment with eugenol.
- Statistical analyses included correlation, group comparison, cluster analysis, and receiver operating characteristic (ROC) analysis.
- Validation and test-retest reliability were assessed in separate cohorts.
Main Results:
- Nasal airflow parameters showed weak correlations with olfactory discrimination, identification, and VAS scores.
- Participants with olfactory dysfunction (OD) exhibited significantly lower flow and velocity change ratios compared to controls.
- The airflow test demonstrated modest diagnostic accuracy (AUC 0.71) with good specificity (91.7%) but moderate sensitivity (72.7%).
Conclusions:
- The nasal airflow-based assessment is a simple, objective tool with potential as a screening method for olfactory dysfunction.
- However, its weak correlation with established tests and modest diagnostic performance indicate it cannot substitute comprehensive psychophysical olfactory evaluations.
