Although the auditory brainstem response (ABR) is known to be an onset response, the specific relationship between stimulus onset properties and the resulting ABR is not well understood. In this study, the effects of stimulus onset on dolphin ABR were examined by measuring ABRs in six bottlenose dolphins while systematically manipulating rise time and plateau sound pressure of cosine-enveloped noise bursts. Noise bursts were spectrally “pink” with frequency content from 10 to 160 kHz, rise times from 32 μs to 4 ms, and plateau sound pressure levels from 102 to 138 dB re 1 μPa. Envelope rise time and plateau sound pressure alone were found to be poor predictors for ABR peak amplitudes and latencies. Peak amplitudes were well described by the envelope sound pressure at the end of a 260-μs window; however, best-fits to the data across ABR peaks were obtained when the window start time was allowed to vary. Peak latencies were best described by the maximum value of the second derivative of the pressure envelope. These results are consistent with single-unit and nearfield response data for terrestrial mammals and indicate that stimuli with rise times greater than 260 μs are non-optimal with respect to maximizing ABR amplitudes.
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May 20 2019
Effects of stimulus cosine onset properties on bottlenose dolphin (Tursiops truncatus) auditory brainstem responses
Ryan Jones;
Ryan Jones
a)
National Marine Mammal Foundation
, 2240 Shelter Island Drive #200, San Diego, California 92106, USA
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James J. Finneran;
James J. Finneran
US Navy Marine Mammal Program, Naval Information Warfare Center Pacific
, Code 56710, 53560 Hull Street, San Diego, California 92152, USA
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Jason Mulsow;
Jason Mulsow
National Marine Mammal Foundation
, 2240 Shelter Island Drive #200, San Diego, California 92106, USA
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Robert F. Burkard
Robert F. Burkard
Department of Rehabilitation Science, University of Buffalo
, 626 Kimball Tower, Buffalo, New York 14214, USA
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a)
Electronic mail: ryan.jones@nmmpfoundation.org
J. Acoust. Soc. Am. 145, 2994–3002 (2019)
Article history
Received:
January 10 2019
Accepted:
April 25 2019
Citation
Ryan Jones, James J. Finneran, Jason Mulsow, Robert F. Burkard; Effects of stimulus cosine onset properties on bottlenose dolphin (Tursiops truncatus) auditory brainstem responses. J. Acoust. Soc. Am. 1 May 2019; 145 (5): 2994–3002. https://doi.org/10.1121/1.5108613
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