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Auditory brain stem responses evoked by different chirps based on different delay models.

Mario Cebulla1, Claus Elberling

  • 1ENT Clinic, Julius Maximilian-University, Würzburg, Germany. mario.cebulla@mail.uni-wuerzburg.de

Journal of the American Academy of Audiology
|September 3, 2010
PubMed
Summary
This summary is machine-generated.

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The optimal chirp stimulus for auditory brain stem response (ABR) testing in normal-hearing individuals varies with sound level, being shorter at higher levels and longer at lower levels. Chirps generally yield larger ABRs than clicks, especially at lower stimulus intensities.

Area of Science:

  • Auditory Neuroscience
  • Signal Processing in Hearing

Background:

  • A cochlear delay model informs chirp stimulus design to counteract auditory periphery temporal dispersion.
  • Intersubject variability in delay models suggests average-based chirps may not universally optimize auditory brain stem response (ABR) amplitude.
  • Chirp efficiency for ABR generation varies with stimulus level, indicating level-dependent latency changes in the delay model.

Purpose of the Study:

  • To examine how ABRs in normal-hearing subjects differ across five distinct chirp stimuli.
  • To investigate the impact of stimulus level on the efficiency of various chirp types for ABR generation.

Main Methods:

  • Six stimuli, including a click and five chirps derived from a delay model with identical spectra, were presented.
  • Auditory brain stem responses (ABRs) were recorded from 50 normal-hearing participants at 50 and 30 dB nHL using quasi-simultaneous stimulation.

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  • ABR peak-to-trough amplitude and peak latency were the primary evaluation metrics.

    • Main Results:

    • At 50 dB nHL, shorter chirps produced the largest ABR amplitudes, while longer chirps were optimal at 30 dB nHL.
    • All five chirps significantly increased ABR amplitude compared to the click stimulus.
    • The amplitude advantage of chirps over clicks was more pronounced at 30 dB nHL than at 50 dB nHL.

    Conclusions:

    • The most effective chirp for evoking broadband ABRs in normal-hearing individuals is level-dependent, shorter at higher levels and longer near threshold.
    • The amplitude differences between chirps of varying durations were modest, raising questions about practical implementation benefits over clicks.
    • The primary benefit of using chirps over clicks for ABR appears at lower stimulus levels.