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Postauricular Muscle Reflex as a Potential Objective Measure of Auditory Function in Normal-Hearing Adults.

Jan-Erik Müller1, Jose Luis Vargas Luna2, Daniela Korth1

  • 1Department of Otorhinolaryngology, Jena University Hospital, 07747 Jena, Germany.

Sensors (Basel, Switzerland)
|May 4, 2026
PubMed
Summary

This study establishes a reliable method for measuring the postauricular muscle reflex (PAMR) in normal-hearing adults. Findings reveal short- and mid-latency responses influenced by auditory and eye movement factors.

Keywords:
acousticear musclesevoked potentialshearingobjective measurereflex

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Area of Science:

  • Neuroscience
  • Audiology
  • Oculomotor Function

Background:

  • The postauricular muscle reflex (PAMR) is an objective measure of auditory brainstem function.
  • Characterizing PAMR under controlled conditions is crucial for clinical applications.

Purpose of the Study:

  • To establish a standardized protocol for measuring PAMR in normal-hearing adults.
  • To characterize short- and mid-latency PAMR components.
  • To investigate the influence of auditory stimulation parameters and eye position on PAMR.

Main Methods:

  • Electromyography recorded PAMR in 43 normal-hearing adults.
  • Auditory stimuli (50 ms, 80-100 dB(A)) presented at 500-4000 Hz.
  • Varied stimulation side (ipsilateral/contralateral) and eye position (forward/rotated).
  • Linear mixed-effects models analyzed amplitude and latency.

Main Results:

  • A short-latency PAMR (10-25 ms) was consistently observed.
  • Reflex amplitude was significantly influenced by stimulation side, eye position, frequency, and intensity.
  • Contralateral stimulation yielded stronger responses than ipsilateral.
  • A mid-latency PAMR (37-50 ms) detected in 91% of participants, with lower amplitude.
  • Both PAMR components were significantly affected by experimental conditions.

Conclusions:

  • PAMR is reliably measurable in normal-hearing adults under controlled conditions.
  • Short- and mid-latency PAMR components are influenced by auditory and oculomotor factors.
  • Provides normative data for future studies in clinical populations, including cochlear implant users and those with hearing loss.