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Related Experiment Videos

The post-auricular muscle response: an objective electrophysiological method for evaluating hearing sensitivity.

Suzanne C Purdy1, Katrina B Agung, David Hartley

  • 1National Acoustic Laboratories, Sydney, NSW, Australia. suzanne.purdy@nal.gov.au

International Journal of Audiology
|December 29, 2005
PubMed
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Post-auricular muscle responses (PAMRs) show promise for objective hearing assessment. Optimized conditions, including eye turning, significantly enhance PAMR detection in normal-hearing adults, suggesting its utility alongside auditory brainstem responses (ABR).

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Objective hearing assessment is crucial for diagnosing hearing loss.
  • Auditory brainstem response (ABR) is a common objective measure.
  • Post-auricular muscle responses (PAMRs) offer a potential alternative or adjunct.

Purpose of the Study:

  • To investigate the characteristics of PAMRs in normal-hearing and sensorineural hearing-impaired adults.
  • To determine factors influencing PAMR amplitude and latency.
  • To evaluate the potential of PAMR as an objective hearing assessment tool.

Main Methods:

  • PAMRs were recorded in 16 normal-hearing and 20 hearing-impaired adults.
  • Click stimuli were presented at varying intensities (20-80 dB nHL) via insert earphones.

Related Experiment Videos

  • Testing included monaural and binaural conditions, with and without eye turning.

    • Main Results:

    • PAMR amplitude decreased and latency increased with lower click intensity.
    • Binaural stimulation and eye turning significantly enhanced PAMR.
    • PAMR thresholds correlated with audiometric thresholds in hearing-impaired subjects under eyes-turned conditions.

    Conclusions:

    • PAMR is a robust electrophysiological response.
    • Optimized conditions, particularly eye turning, improve PAMR detection.
    • PAMR may serve as a valuable adjunct to ABR for objective hearing assessment, especially in infant screening contexts.