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Updated: Jul 3, 2026

A Free-breathing fMRI Method to Study Human Olfactory Function
Published on: July 30, 2017
Event-related potentials in patients with olfactory loss
Annika Brämerson1, Eva Millqvist, Bo Ydse
1Department of Otorhinolaryngology, Central Hospital, Skövde, Sweden.
Olfactory event-related potentials (OERPs) show promise for objectively assessing smell function. Higher OERP amplitudes and shorter latencies in healthy individuals suggest OERPs can differentiate olfactory impairment.
Area of Science:
- Neuroscience
- Ophthalmology
Background:
- Olfactory dysfunction affects quality of life.
- Objective measures of olfactory function are needed for clinical assessment.
Purpose of the Study:
- To evaluate olfactory event-related potentials (OERPs) in patients with olfactory impairment and healthy controls.
- To investigate the dose-response relationship of odor concentration on OERP parameters.
- To explore the clinical utility of OERPs.
Main Methods:
- 23 patients with olfactory impairment and 24 controls participated.
- Olfactory function assessed via odor threshold and identification tests.
- OERPs recorded using butanol at two concentrations via an olfactometer.
Main Results:
- OERP amplitudes increased, and latencies shortened with rising stimulus concentration.
- Healthy subjects exhibited higher OERP amplitudes and shorter latencies than patients.
- OERPs demonstrated a dose-response effect and group differentiation.
Conclusions:
- Olfactory event-related potentials (OERPs) offer an objective method for assessing olfactory function.
- OERPs show potential for differentiating between impaired and healthy olfactory function.
- Further validation is required for routine clinical application of OERPs.
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