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Technical aspects of brainstem evoked potential audiometry using tones

D R Stapells, T W Picton

    Ear and Hearing
    |January 1, 1981
    PubMed
    Summary
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    High-pass filter settings significantly alter brainstem auditory evoked potential morphology. Response amplitude remains stable at presentation rates up to 35/sec, but frequency specificity requires careful control of tone rise times and masking.

    Area of Science:

    • Auditory Neuroscience
    • Neurophysiology
    • Signal Processing

    Background:

    • Brainstem auditory evoked potentials (BAEPs) are crucial for assessing auditory pathway function.
    • The vertex-positive component is typically dominant in brief tone responses.
    • Filter settings can influence the observed waveform morphology.

    Purpose of the Study:

    • To investigate the impact of high-pass filter settings on BAEP morphology.
    • To determine the effect of stimulus presentation rate on BAEP amplitude.
    • To evaluate the influence of tone rise time and intensity on frequency specificity.

    Main Methods:

    • Recording BAEPs to brief tones with varying high-pass filter settings (>20 Hz).
    • Analyzing changes in waveform morphology, particularly the prominence of vertex-negative waves.

    Related Experiment Videos

  • Assessing BAEP amplitude across stimulus presentation rates up to 35/sec.
  • Examining the effect of tone rise times (up to 5 msec) and high intensities on frequency specificity.
  • Utilizing notched noise masking for frequency-specific response assessment.

    • Main Results:

    • High-pass filter settings above 20 Hz, especially with steep rolloffs, shift prominence to a vertex-negative wave.
    • BAEP amplitude is unaffected by presentation rates up to 35/sec.
    • Longer tone rise times improve frequency specificity, but responses diminish significantly beyond 5 msec.
    • At high intensities, responses lack complete frequency specificity, necessitating notched noise masking.

    Conclusions:

    • Filter selection critically impacts BAEP waveform interpretation.
    • Stimulus presentation rate is a robust parameter for BAEP amplitude.
    • Achieving frequency-specific BAEPs requires optimization of tone rise time and appropriate masking techniques, particularly at high intensities.