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Related Experiment Videos

Gravity receptor function in mice with graded otoconial deficiencies.

Sherri M Jones1, Lawrence C Erway, Kenneth R Johnson

  • 1School of Medicine, University of Missouri, Columbia, MO 65212, USA. jonessh@mail.ecu.edu

Hearing Research
|April 28, 2004
PubMed
Summary

Gravity receptor function in mice with otoconial deficits was assessed using vestibular evoked potentials (VsEPs). Results show VsEPs correlate with otoconial loss, but behavior alone is an unreliable indicator of sensory deficits.

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Area of Science:

  • Neuroscience
  • Sensory Biology
  • Genetics

Background:

  • Otoconia are crucial for gravity sensing in the vestibular system.
  • Mutant mouse models offer insights into otoconial development and function.
  • Vestibular evoked potentials (VsEPs) measure gravity receptor function.

Purpose of the Study:

  • To investigate gravity receptor function in mice with genetic otoconial deficits.
  • To correlate otoconial structure with vestibular function.
  • To assess the behavioral impact of impaired gravity sensation.

Main Methods:

  • Utilized mutant mouse strains (lethal milk, pallid, tilted, mocha, muted) with varying otoconial deficits.
  • Measured gravity receptor function via linear vestibular evoked potentials (VsEPs).

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  • Documented cage and swimming behaviors; analyzed temporal bones for otoconial integrity.

    • Main Results:

    • Absence of otoconia led to absent VsEPs.
    • VsEP thresholds and amplitudes varied with the degree of otoconial loss.
    • In lethal milk mice, VsEP amplitudes strongly correlated with saccular otoconial loss (R = 0.77).
    • Behavioral deficits (swimming ability) were not always indicative of VsEP abnormalities.

    Conclusions:

    • Vestibular evoked potentials provide a reliable measure of gravity receptor function.
    • Variable otoconial deficits result in corresponding changes in VsEPs.
    • Neurobehavioral adaptation can mask sensory deficits, highlighting the limitations of behavior alone in assessing vestibular function.