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Effects of eye position on the vestibular evoked myogenic potential

Effects of eye position on the vestibular evoked myogenic potential
Effects of eye position on the vestibular evoked myogenic potential
Conclusion: The position of a subject's eyes during vestibular evoked myogenic potential (VEMP) recording significantly alters the magnitude of the response. This change is largely due to an alteration in the tonicity of the sternocleidomastoid muscle (SCM) caused by variations in the position of the eye. However, even if electromyographic (EMG) normalization is conducted effects of eye position remain.
Objective: To determine if eye position has a significant effect on the magnitude of the VEMP.
Subjects and methods: VEMPs were collected from 32 ears measured on 16 healthy subjects. The recordings were made unilaterally using the head turn method. The acoustic stimuli were 500 Hz air-conduction short tone bursts. VEMPs were measured in three recording conditions: (i) eyes in the same direction as head turn, (ii) eyes straight ahead, (iii) eyes in the opposite direction to head turn.
Results: All 32 ears tested showed a VEMP response with eyes in all three positions. Repeated measures analysis of variance (RM-ANOVA) verified an overall significant effect of eye position (p<0.001). Post hoc paired t tests revealed statistically significant differences between the eyes opposite and the other two conditions (p<0.001). Normalization of the VEMP magnitude using pre-stimulus EMG reduced the effect; however, some variability remained.
vemp, tonic contraction, tonicity, gaze, eye rotation, eye position, emg, scm
0001-6489
175-178
Sandhu, J.S.
b79a5839-20d8-4a80-a623-daad6097f361
Bell, S.L.
91de0801-d2b7-44ba-8e8e-523e672aed8a
Sandhu, J.S.
b79a5839-20d8-4a80-a623-daad6097f361
Bell, S.L.
91de0801-d2b7-44ba-8e8e-523e672aed8a

Sandhu, J.S. and Bell, S.L. (2008) Effects of eye position on the vestibular evoked myogenic potential. Acta Oto-Laryngologica, 129 (2), 175-178. (doi:10.1080/00016480802043956).

Record type: Article

Abstract

Conclusion: The position of a subject's eyes during vestibular evoked myogenic potential (VEMP) recording significantly alters the magnitude of the response. This change is largely due to an alteration in the tonicity of the sternocleidomastoid muscle (SCM) caused by variations in the position of the eye. However, even if electromyographic (EMG) normalization is conducted effects of eye position remain.
Objective: To determine if eye position has a significant effect on the magnitude of the VEMP.
Subjects and methods: VEMPs were collected from 32 ears measured on 16 healthy subjects. The recordings were made unilaterally using the head turn method. The acoustic stimuli were 500 Hz air-conduction short tone bursts. VEMPs were measured in three recording conditions: (i) eyes in the same direction as head turn, (ii) eyes straight ahead, (iii) eyes in the opposite direction to head turn.
Results: All 32 ears tested showed a VEMP response with eyes in all three positions. Repeated measures analysis of variance (RM-ANOVA) verified an overall significant effect of eye position (p<0.001). Post hoc paired t tests revealed statistically significant differences between the eyes opposite and the other two conditions (p<0.001). Normalization of the VEMP magnitude using pre-stimulus EMG reduced the effect; however, some variability remained.

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More information

Published date: February 2008
Keywords: vemp, tonic contraction, tonicity, gaze, eye rotation, eye position, emg, scm
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 65199
URI: http://eprints.soton.ac.uk/id/eprint/65199
ISSN: 0001-6489
PURE UUID: 544c40cc-2a83-4841-b645-239a30584bfe

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Date deposited: 11 Feb 2009
Last modified: 15 Mar 2024 12:06

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Contributors

Author: J.S. Sandhu
Author: S.L. Bell

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