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Unilateral centrifugation: utricular assessment and protocol comparison.

Kristen L Janky¹, Neil T Shepard

¹Boys Town National Research Hospital, Omaha, Nebraska 68131, USA. kristen.janky@boystown.org

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology

|November 25, 2010

Summary

Two methods of lateral translation did not significantly impact ocular torsion, subjective visual vertical (SVV), or nausea in healthy individuals. Both methods showed symmetrical responses and a linear relationship with gravito-inertial acceleration.

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Area of Science:

Vestibular system research
Human physiology
Neuroscience

Background:

The otolith organs, particularly the utricle, play a crucial role in sensing linear acceleration and gravity.
Understanding how the brain integrates gravito-inertial forces is essential for deciphering spatial orientation and balance.
Previous research indicates that vestibular stimulation can influence subjective visual vertical (SVV) and ocular torsion.

Purpose of the Study:

To compare the effects of two distinct lateral translation methods on subjective visual vertical (SVV), ocular torsion, and nausea.
To investigate the relationship between lateral translation, vestibular responses, and perceived nausea in healthy adults.

Main Methods:

A prospective study involving eleven healthy control subjects.
Subjects underwent two randomized lateral translation paradigms: translation followed by rotation, and translation during rotation.
Measurements included ocular torsion, SVV deviation, and nausea levels assessed via a visual analog scale.

Main Results:

No significant differences were observed in ocular torsion, SVV deviation, or nausea between the two lateral translation methods.
Both ocular torsion and SVV deviation exhibited symmetrical responses to the right and left within each method.
A linear relationship was found between ocular torsion, SVV deviation, and the gravito-inertial acceleration vector.

Conclusions:

Unilateral utricular stimulation systematically offsets ocular torsion and SVV, irrespective of the lateral translation method employed.
Subjective nausea levels did not significantly differ between the tested lateral translation methods.
These findings contribute to understanding the otolith system's response to complex motion stimuli.