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Related Experiment Video

Updated: Jul 15, 2026

Three Dimensional Vestibular Ocular Reflex Testing Using a Six Degrees of Freedom Motion Platform

Three Dimensional Vestibular Ocular Reflex Testing Using a Six Degrees of Freedom Motion Platform

Published on: May 23, 2013

Head taps evoke a crossed vestibulo-ocular reflex.

S Iwasaki¹, L A McGarvie, G M Halmagyi

¹Vestibular Research Laboratory, School of Psychology, University of Sydney, Sydney, NSW, Australia.

|April 11, 2007

Summary

Tapping the forehead elicits eye responses, indicating vestibular function. These responses are linked to the otolith-ocular reflex, even with hearing loss.

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Area of Science:

Neuroscience
Ophthalmology
Vestibular System

Background:

The otolith-ocular reflex (OOR) stabilizes gaze during head movements.
Vestibular pathways, particularly otolith pathways, are crucial for maintaining balance and visual stability.
Non-invasive methods to assess vestibular function are essential for diagnosing and managing balance disorders.

Purpose of the Study:

To investigate a novel method for assessing vestibular function using forehead stimulation.
To determine the origin and pathways of short-latency surface potentials recorded beneath the eyes after forehead taps.
To evaluate the clinical utility of this response in differentiating vestibular from cochlear dysfunction.

Main Methods:

Surface potentials were recorded from electrodes placed below the eyes in healthy subjects.
Stimulation was applied to the forehead midline at the hairline (Fz) using a reflex hammer or bone conduction vibrator.
Subjects included healthy individuals, those with sensorineural hearing loss, and patients with a history of vestibular nerve section.

Main Results:

Forehead stimulation consistently elicited short-latency negative surface potentials beneath both eyes in healthy subjects.
These responses were absent in the eye contralateral to the side of prior vestibular nerve section.
The responses remained intact in subjects with sensorineural hearing loss, dissociating them from auditory pathways.

Conclusions:

Forehead-induced eye potentials reflect vestibular input, likely mediated by crossed otolith-ocular pathways.
This technique offers a promising, non-invasive method for evaluating otolith function.
The findings suggest a potential diagnostic tool for vestibular disorders, distinct from hearing assessments.