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Assessment of Static Graviceptive Perception in the Roll-Plane using the Subjective Visual Vertical Paradigm
Published on: April 28, 2020
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Subjective visual vertical (SVV) patterns obtained using different translation times during unilateral centrifugation
Jorge E González1, John E King1, Alexander Kiderman2
1Department of Audiology and Speech-Language Pathology, Bloomsburg University of Pennsylvania, Bloomsburg, PA.
Journal of the American Academy of Audiology
|July 18, 2014
Summary
Optimizing translation time during unilateral centrifugation (UC) is crucial for accurate utricular function testing. Longer translation times in UC yield more consistent subjective visual vertical (SVV) results, suggesting they are better for clinical use.
Area of Science:
- Vestibular science
- Neuroscience
- Ophthalmology
Background:
- Unilateral centrifugation (UC) is a diagnostic tool assessing utricular function by stimulating one utricle during rotation.
- Current UC protocols vary in translation times between eccentric and centric positions, impacting test standardization.
Purpose of the Study:
- To investigate how different translation times during UC affect perceived subjective visual vertical (SVV).
- To determine optimal translation durations for reliable UC testing.
Main Methods:
- A prospective, repeated measures design was employed with 43 healthy young adults.
- Participants underwent unilateral centrifugation (UC) at 300°/sec with 4 cm eccentric displacements, testing randomized translation times (5-30 sec).
- Static (sSVV) and dynamic (dSVV) subjective visual vertical were measured to assess responses.
Main Results:
- Shorter UC translation times (e.g., 5 sec) showed greater dSVV variability and longer stabilization periods.
- Fewer clinically abnormal dSVV findings were observed with longer translation times (15 and 25 sec).
- Longer translation times correlated with lower response variance and better data consistency.
Conclusions:
- Findings suggest longer UC translation times improve the reliability and consistency of dSVV measurements.
- Incorporating static SVV (sSVV) may help normalize dynamic SVV (dSVV) data, accounting for baseline otolithic function.
- Optimizing UC translation time and including sSVV in interpretation could enhance clinical utility.
