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Related Experiment Videos

Lateralized differences in olfactory function.

Volker Gudziol1, Cornelia Hummel, Simona Negoias

  • 1Smell and Taste Clinic, Department of Otorhinolaryngology, University of Dresden Medical School, Dresden, Germany.

The Laryngoscope
|May 3, 2007
PubMed
Summary
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Unilateral olfactory loss may be missed by testing both nostrils. This study found significant odor identification side differences in healthy individuals and patients with nasal conditions, suggesting further investigation is warranted.

Area of Science:

  • Olfactory neuroscience
  • Clinical otolaryngology

Background:

  • Bilateral odor identification testing may not detect unilateral olfactory loss.
  • Assessing olfactory function requires evaluating each nostril independently.

Purpose of the Study:

  • To evaluate side differences in odor identification in healthy subjects and patients with nasal symptoms.
  • To determine the prevalence of olfactory side differences in various populations.

Main Methods:

  • A 12-item odor identification test ('Sniffin' Sticks') was administered to 479 healthy subjects, 765 patients with chronic rhinosinusitis (CRS), and 53 tumor patients.
  • Olfactory function was assessed separately for each nostril.

Main Results:

  • 15% of healthy subjects showed side differences in odor identification.

Related Experiment Videos

  • Elderly healthy subjects exhibited greater side differences than younger ones.
  • Patients with CRS and tumors demonstrated larger odor identification side differences compared to healthy individuals.

    • Conclusions:

    • Side differences in odor identification exceeding 25% warrant further investigation.
    • Future research should explore if olfactory side differences predict general olfactory loss risk.