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Vestibular Evoked Myographic Correlation.

Bernd Lütkenhöner1

  • 1ENT Clinic, Münster University Hospital, Kardinal-von-Galen-Ring 10, 48129, Münster, Germany. lutkenh@uni-muenster.de.

Journal of the Association for Research in Otolaryngology : JARO
|November 14, 2018
PubMed
Summary
This summary is machine-generated.

Researchers discovered a new electrophysiological response, the vestibular evoked myographic correlation (VEMCorr), using continuous stochastic stimulation. This novel VEMCorr response closely resembles the traditional vestibular evoked myogenic potential (VEMP).

Keywords:
VEMCorrVEMPelectromyogramstimulus envelopevestibular evoked myogenic potential

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Area of Science:

  • Neuroscience
  • Auditory and Vestibular System Physiology
  • Electrophysiology

Background:

  • The vestibular evoked myogenic potential (VEMP) is a known electrophysiological response typically induced by transient auditory stimuli.
  • The underlying physiological mechanisms of VEMP involve changes in motor unit action potentials (MUAPs) in response to stimulus amplitude fluctuations.
  • A hypothesis proposed that continuous stochastic stimulation could also elicit VEMP-like responses.

Purpose of the Study:

  • To investigate the hypothesis that continuous stochastic stimulation can induce vestibular evoked myogenic potential (VEMP)-like physiological processes.
  • To theoretically analyze the relationship between stimulus envelope and electromyogram (EMG) activity.
  • To identify and characterize a novel electrophysiological response, termed vestibular evoked myographic correlation (VEMCorr).

Main Methods:

  • Theoretical analysis of the effective stimulus, assumed to be related to the stimulus envelope, and its correlation with EMG.
  • Experimental validation using a paradigm combining transient 500-Hz tone pulses (for VEMP) and continuous 500-Hz narrow-band noise (for VEMCorr).
  • Stimulation delivered via a hand-held minishaker to 12 test persons.

Main Results:

  • Theoretical analysis predicted VEMP-like properties in the cross-correlation function between the effective stimulus and EMG.
  • All 12 participants exhibited a clear VEMCorr response.
  • The VEMCorr response closely resembled the conventional VEMP response.

Conclusions:

  • The study provides evidence for a novel electrophysiological response, VEMCorr, elicited by continuous stochastic stimulation.
  • VEMCorr and VEMP appear to be distinct manifestations of a shared underlying physiological mechanism.
  • This mechanism suggests a roughly linear relationship between stimulus envelope and expected EMG activity, with potential applications for continuous stimulation paradigms.