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Related Experiment Video

Updated: Dec 23, 2025

Simple and Computer-assisted Olfactory Testing for Mice

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Published on: June 15, 2015

A New Method for Assessment of Retronasal Olfactory Function.

Ayaho Yoshino^1,2, Goekhan Goektas¹, Mehmet K Mahmut^1,3

¹Smell and Taste Clinic, Department of Otorhinolaryngology, Technical University of Dresden, Dresden, Germany.

The Laryngoscope

|April 29, 2020

Summary

A new test using tasteless powders effectively assesses retronasal olfaction (smell perception through the nose) in individuals with and without olfactory disorders. This reliable method differentiates between healthy individuals and those with impaired smell.

Keywords:

Olfaction disorders retronasal identification test retronasal olfaction smell

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Area of Science:

Otolaryngology
Neuroscience
Sensory Science

Background:

Olfactory dysfunction affects a significant portion of the population.
Assessing retronasal olfaction, crucial for flavor perception, presents unique challenges.
Existing methods for evaluating retronasal olfaction can be complex or lack standardization.

Purpose of the Study:

To develop and validate a novel test for assessing retronasal olfaction.
To utilize "tasteless" powders as stimuli for evaluating smell perception via the retronasal pathway.
To differentiate between healthy individuals and those with olfactory disorders using the developed test.

Main Methods:

A prospective case-control study involving 150 participants (100 healthy, 50 with olfactory loss).
Orthonasal olfaction assessed using the Sniffin' Sticks test battery.
Retronasal olfaction evaluated using 16 distinct "tasteless" powders administered orally.

Main Results:

The developed test successfully differentiated between normosmic participants and those with olfactory loss.
A high correlation was observed between retronasal and orthonasal olfactory function.
Test-retest reliability was established for both olfactory pathways in healthy participants.

Conclusions:

A reliable test for retronasal olfaction using 16 stimuli has been developed.
This test can effectively distinguish between individuals with and without olfactory loss.
The findings support the use of this novel method for clinical assessment of olfactory disorders.