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Towards fully objective evoked response audiometry.

R J McClelland, B M Sayers

    British Journal of Audiology
    |November 1, 1983
    PubMed
    Summary
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    Auditory brainstem response (ABR) analysis shows that phase measures, not amplitude, are better indicators of hearing threshold. Objective ABR threshold determination may benefit from focusing on phase aggregation.

    Area of Science:

    • Auditory Neuroscience
    • Signal Processing
    • Electroencephalography

    Background:

    • Auditory brainstem potentials (ABRs) are crucial for assessing auditory function.
    • Analyzing ABRs involves examining amplitude and phase spectra of evoked potentials.
    • Current methods for determining hearing thresholds can be subjective.

    Purpose of the Study:

    • To investigate differences in amplitude and phase spectra between pre-stimulus and post-stimulus epochs of ABRs.
    • To evaluate the influence of stimulus intensity on ABR spectral characteristics.
    • To determine if phase or amplitude measures are more effective for objective hearing threshold determination.

    Main Methods:

    • Analysis of amplitude and phase spectra of auditory brainstem potentials evoked by free-field stimuli.

    Related Experiment Videos

  • Comparison of spectral characteristics between pre-stimulus and post-stimulus records.
  • Examination of ensemble mean amplitude and phase standard deviation across varying stimulus intensities.
  • Comparison of threshold and sub-threshold responses.

    • Main Results:

    • Significant differences were observed in amplitude spectra between pre-stimulus and post-stimulus records, particularly for low harmonics and high-intensity stimuli.
    • Ensemble mean amplitude decreased with stimulus intensity, while phase aggregation lessened.
    • Phase standard deviation exhibited a more systematic change with stimulus intensity than mean amplitude.
    • Phase standard deviation was significantly smaller for threshold responses compared to sub-threshold responses, unlike amplitude differences.

    Conclusions:

    • Objective hearing threshold determination may be more reliably achieved using ensemble phase measures rather than amplitude measures.
    • Phase aggregation in auditory brainstem potentials provides a robust indicator of auditory threshold.
    • Further research into phase-based objective threshold determination methods is warranted.