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J Am Acad Audiol 2021; 32(09): 588-595
DOI: 10.1055/s-0041-1733968
Research Article

Effects of Stimulus Polarity on Amplitude-Modulated Cervical Vestibular-Evoked Myogenic Potentials

Christopher G. Clinard
1   Department of Communication Sciences and Disorders, James Madison University, Harrisonburg, Virginia
,
Kerri J. Lawlor
1   Department of Communication Sciences and Disorders, James Madison University, Harrisonburg, Virginia
,
Erin G. Piker
1   Department of Communication Sciences and Disorders, James Madison University, Harrisonburg, Virginia
› Author Affiliations Funding This work was supported by the American Hearing Research Foundation (Christopher G. Clinard and Erin G. Piker); the funding agency had no involvement in the study design, data collection, analysis or interpretation of data, writing, or decision to submit this manuscript for publication.
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Abstract

Background Traditional approaches to cervical vestibular-evoked myogenic potentials use a transient stimulus to elicit an onset response. However, alternate approaches with long duration stimuli may allow the development of new methodologies to better understand basic function of the vestibular system, as well as potentially developing new clinical applications.

Purpose The objective of this study was to examine the effects of stimulus polarity on response properties of amplitude-modulated cervical vestibular-evoked myogenic potentials (AMcVEMPs).

Research Design Prospective, repeated-measures, within-subjects design.

Study Sample Participants were 16 young, healthy adults (ages 21–38 years).

Data Collection and Analysis Amplitude-modulated tones, with carrier frequency of 500 Hz and modulation frequency of 37 Hz, were used to elicit AMcVEMPs. Responses were analyzed in three different stimulus polarity conditions: condensation, rarefaction, and alternating. The resulting data were analyzed for differences across polarity conditions.

Results AMcVEMP amplitudes, both raw and corrected for tonic muscle activation, were equivalent across the different stimulus phase conditions. In addition, response signal-to-noise ratio and phase coherence were equivalent across the different phases of the stimulus.

Conclusion Analyses of AMcVEMPs are stable when the carrier frequency starting phase is altered and the phase of the temporal envelope is constant.

Keywords

otolith - VEMP - cVEMP - phase locking - stimulus polarity - steady-state

Authors' Contribution

Christopher G. Clinard and Erin G. Piker designed the research and wrote the article. All authors performed the research and analyzed the data.


Disclaimer

Any mention of a product, service, or procedure in the Journal of the American Academy of Audiology does not constitute an endorsement of the product, service, or procedure by the American Academy of Audiology.




Publication History

Received: 28 February 2021

Accepted: 12 June 2021

Article published online:
17 February 2022

© 2022. American Academy of Audiology. This article is published by Thieme.

Thieme Medical Publishers, Inc.
333 Seventh Avenue, 18th Floor, New York, NY 10001, USA

 

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