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Testing of all Six Semicircular Canals with Video Head Impulse Test Systems
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Saccular function is associated with both angular and distance errors on the triangle completion test.

E R Anson1, M R Ehrenburg2, E X Wei2

  • 1Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Otolaryngology, University of Rochester, Rochester, NY, USA.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|October 1, 2019
PubMed
Summary
This summary is machine-generated.

Healthy older adults with age-related vestibular loss, specifically impaired saccular function, showed deficits in spatial navigation accuracy. This highlights the saccule's role in maintaining orientation and estimating position.

Keywords:
AgingGaitPostureSpatial orientationVestibular function

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Area of Science:

  • Neuroscience
  • Gerontology
  • Human Physiology

Background:

  • Age-related vestibular loss is common in older adults.
  • The vestibular system, including the saccule, plays a crucial role in spatial orientation and navigation.
  • Previous research has not fully elucidated the specific contribution of individual vestibular organs to spatial navigation deficits in aging.

Purpose of the Study:

  • To investigate whether healthy older adults with age-related vestibular loss exhibit spatial navigation impairments.
  • To determine the relationship between specific vestibular functions (semicircular canal, saccular, and utricular) and spatial navigation abilities.

Main Methods:

  • 154 healthy older adults from the Baltimore Longitudinal Study of Aging were assessed.
  • Vestibular function was measured for semicircular canals, saccule, and utricle.
  • Spatial navigation was evaluated using the blindfolded Triangle Completion Test (TCT), measuring angular error, endpoint error, and distance walked.
  • Multiple linear regression analyses controlled for age and sex.

Main Results:

  • Individuals with abnormal saccular function demonstrated significantly larger angular errors (β = 4.2°, p < 0.05) and endpoint errors (β = 13.6 cm, p < 0.05).
  • Older age was independently associated with increased angular and endpoint errors per decade.
  • Semicircular canal and utricular function did not show significant associations with TCT performance in this cohort.

Conclusions:

  • Saccular function is a prominent contributor to accurate spatial navigation during blindfolded tasks.
  • Age-related decline in saccular function may lead to spatial disorientation in older adults.
  • Gravitational cues processed by the saccule are likely integrated for estimating place and heading direction.