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Related Concept Videos

Olfaction01:25

Olfaction

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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
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Olfactory Behavioral Testing in the Adult Mouse
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Odor dilution sorting as a clinical test of olfactory function: normative values and reliability data.

Jörn Lötsch1,2, Anne Wolter3, Antje Hähner3

  • 1Goethe-University, Medical Faculty, Institute of Clinical Pharmacology, Theodor Stern Kai 7, 60590 Frankfurt am Main, Germany.

Chemical Senses
|February 24, 2024
PubMed
Summary

A new olfactory sorting test offers a simple, self-administered method for detecting anosmia (loss of smell). This quick test shows high accuracy, providing a practical alternative for clinical smell assessments.

Keywords:
data sciencehuman olfactionolfactory testing

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Area of Science:

  • Olfactory Neuroscience
  • Clinical Sensory Science

Background:

  • Clinical assessment of smell (olfactory function) is important but often resource-intensive.
  • There is a need for efficient, self-administered methods for evaluating olfactory loss.

Purpose of the Study:

  • To evaluate a novel, self-administered olfactory sorting test for detecting anosmia.
  • To determine the test's accuracy and practicality in a clinical setting.

Main Methods:

  • A cohort of 68 patients with olfactory loss and 55 controls underwent testing.
  • The test involved sorting 2 odorants (eugenol, phenylethyl alcohol) in 5 dilutions by intensity.
  • A scoring system based on Kendall's Tau was used to identify anosmia.

Main Results:

  • A cutoff score of ≤0.7 on the olfactory sorting test accurately identified anosmia with 89% balanced accuracy.
  • This accuracy is comparable to traditional odor threshold tests.
  • A score difference of ±0.15 was suggested as a cutoff for clinically significant changes.

Conclusions:

  • The olfactory sorting test is a simple, self-administered tool for detecting anosmia or preserved olfactory function.
  • It offers a practical, user-friendly, and resource-efficient alternative for screening olfactory deficits.
  • The test demonstrates comparable balanced accuracy to existing brief olfactory assessments.