Although commonly recorded as onset responses, the auditory brainstem response (ABR) can also be elicited at stimulus offset. The offset ABR has not been extensively investigated in marine mammals. Three normal hearing (NH) and three hearing impaired (HI) dolphins were assessed while fully submerged in sea water. Stimulus spectrum, level, rise/fall time (RFT), and plateau duration were manipulated. Onset and offset ABR amplitude were quantified as the rms voltage 1–7 ms following stimulus onset or offset, respectively. For the same stimulus conditions, onset and offset responses were often larger for NH than HI dolphins, and offset responses were typically smaller than onset responses. For the level series, offset response amplitude typically increased with increasing stimulus level, although offset responses were not 3 dB above the noisefloor for 113-kHz tonebursts. Increasing RFT decreased onset and offset response amplitude. For the 40-kHz tonebursts, a RFT of 32 μs produced a large amplitude offset ABR in NH dolphins. Offset responses for 113-kHz tonebursts were 3 dB above the noisefloor at the shortest RFTs. Offset responses were largest for 4 ms duration stimuli (likely due to overlapping onset and offset response analysis windows), but otherwise, offset responses changed little with increasing duration.
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September 2020
September 15 2020
Offset auditory brainstem response (ABR) amplitude in bottlenose dolphins
Robert Burkard;
Robert Burkard
a)
1
Department of Rehabilitation Science, University at Buffalo
, 626 Kimball Tower, Buffalo, New York 14260, USA
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James J. Finneran
;
James J. Finneran
b)
2
U.S. 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
3
National Marine Mammal Foundation
, 2240 Shelter Island Drive #200, San Diego, California 92106, USA
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Ryan Jones
Ryan Jones
c)
3
National Marine Mammal Foundation
, 2240 Shelter Island Drive #200, San Diego, California 92106, USA
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a)
Electronic mail: rfb@buffalo.edu
b)
ORCID: 0000-0002-0969-8033.
c)
Current address: Long Marine Laboratory, Institute of Marine Sciences, University of California Santa Cruz, Santa Cruz, CA 95060, USA.
J. Acoust. Soc. Am. 148, 1445–1455 (2020)
Article history
Received:
June 23 2020
Accepted:
August 14 2020
Citation
Robert Burkard, James J. Finneran, Jason Mulsow, Ryan Jones; Offset auditory brainstem response (ABR) amplitude in bottlenose dolphins. J. Acoust. Soc. Am. 1 September 2020; 148 (3): 1445–1455. https://doi.org/10.1121/10.0001900
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