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Data Acquisition and Analysis In Brainstem Evoked Response Audiometry In Mice
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Offset auditory brainstem response (ABR) amplitude in bottlenose dolphins.

Robert Burkard1, James J Finneran2, Jason Mulsow3

  • 1Department of Rehabilitation Science, University at Buffalo, 626 Kimball Tower, Buffalo, New York 14260, USA.

The Journal of the Acoustical Society of America
|October 2, 2020
PubMed
Summary

The auditory brainstem response (ABR) can be measured at stimulus offset in dolphins. Offset ABRs were smaller than onset responses but detectable in normal-hearing dolphins.

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Area of Science:

  • Marine biology
  • Auditory neuroscience
  • Bioacoustics

Background:

  • Auditory brainstem response (ABR) is typically measured at stimulus onset.
  • Offset ABR, elicited at stimulus termination, is less studied, especially in marine mammals.
  • Understanding ABR in dolphins is crucial for assessing their auditory health in noisy environments.

Purpose of the Study:

  • Investigate the characteristics of offset auditory brainstem response (ABR) in dolphins.
  • Compare offset ABRs with onset ABRs in normal-hearing and hearing-impaired dolphins.
  • Determine the influence of stimulus parameters on offset ABR amplitude.

Main Methods:

  • Assessed three normal-hearing and three hearing-impaired dolphins submerged in seawater.
  • Manipulated stimulus spectrum, level, rise/fall time (RFT), and plateau duration.
  • Quantified onset and offset ABR amplitude using rms voltage.

Main Results:

  • Offset ABRs were generally smaller than onset ABRs but detectable in normal-hearing dolphins.
  • Offset ABR amplitude increased with stimulus level and was influenced by RFT and duration.
  • Hearing-impaired dolphins showed smaller responses compared to normal-hearing dolphins.

Conclusions:

  • Offset ABR is a viable measure in dolphins, providing insights into auditory function.
  • Stimulus parameters like RFT significantly impact offset ABR amplitude.
  • Offset ABR can potentially differentiate hearing status in dolphins.