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Normative behavioral thresholds for short tone-bursts.

R C Beattie1, I Rochverger

  • 1Department of Communicative Disorders, California State University-Long Beach, 90840, USA.

Journal of the American Academy of Audiology
|November 9, 2001
PubMed
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Establishing national standards for Auditory Brainstem Response (ABR) tone-burst calibration is crucial. This study provides normative threshold data for tone-burst stimuli to ensure reproducible ABR evaluations across different settings.

Area of Science:

  • Audiology
  • Neuroscience
  • Biophysics

Background:

  • Auditory Brainstem Response (ABR) evaluations commonly use tone-bursts.
  • Established national standards for normal tone-burst calibration values are lacking.

Purpose of the Study:

  • To gather normative threshold data for tone-burst stimuli.
  • To establish a reproducible physical reference for tone-burst calibration in clinical and laboratory settings.

Main Methods:

  • Collected normative data for 3-msec tone-bursts.
  • Tested two repetition rates (9.3/sec and 39/sec).
  • Evaluated two gating functions (Trapezoid and Blackman) at four frequencies (500, 1000, 2000, 4000 Hz).

Main Results:

Related Experiment Videos

  • Higher stimulus rates (39/sec) yielded approximately 3 dB lower tone-burst thresholds compared to lower rates (9.3/sec).
  • The Trapezoid gating function resulted in thresholds averaging 1.4 dB lower than the Blackman function.
  • Results are specified using dB peak SPL, dB peak-to-peak equivalent SPL, and dB SPL (fast meter response).

    • Conclusions:

    • The findings offer data for calibrating ABR equipment.
    • Increased stimulus rate may improve thresholds due to temporal integration in the auditory system.
    • While differences in gating are small, cumulative variables can impact clinical significance.