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Related Experiment Videos

Quantitative EEG analysis in post-traumatic anosmia.

E Bonanni1, D Borghetti, M Fabbrini

  • 1Department of Neurosciences, Section of Neurology, University of Pisa, Via Roma 67, 56124 Pisa, Italy. e.bonanni@neuro.med.unipi.it

Brain Research Bulletin
|November 23, 2006
PubMed
Summary

This study introduces the Olfactory Stop Reaction (OSR) using electroencephalography (EEG) to objectively assess olfactory deficits after head trauma. The OSR method successfully identified olfactory dysfunction in patients with rare alpha EEG activity.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Audiology

Background:

  • Objective quantification of olfactory deficit and anosmia, particularly post-head trauma, is crucial.
  • Traditional electroencephalography (EEG) for olfactory testing faces challenges with 'alpha rare' activity.
  • Olfactoelectroencephalography (olfactoEEG) relies on brain activity desynchronization following olfactory stimuli.

Purpose of the Study:

  • To evaluate the Olfactory Stop Reaction (OSR) in patients with post-traumatic anosmia and 'alpha rare' EEG.
  • To utilize frequency band power calculation and topographical mapping for objective olfactory function assessment.

Main Methods:

  • Twenty-five patients with post-traumatic anosmia underwent EEG recording with olfactory stimulation.
  • Analysis involved frequency band power calculation and topographical mapping to detect the OSR.

Related Experiment Videos

  • Signal processing focused on changes in alpha and theta band power.

    • Main Results:

    • An Olfactory Stop Reaction (OSR) was detected in 17 out of 25 patients.
    • Patients with OSR showed a significant decrease in occipital alpha band power and an increase in frontal/central theta band power post-stimulation.
    • No significant band power variations were observed in the remaining eight patients.

    Conclusions:

    • Automatic EEG signal analysis for OSR offers an objective method for olfactory function evaluation.
    • This approach overcomes limitations of psychophysical methods and traditional EEG.
    • The study aims to contribute to the standardization of olfactory function assessment.