The purpose of the present study was to compare auditory brainstem responses (ABRs) using two approaches that allow the use of high stimulation rates, but with different temporal variability in the interstimulus interval: maximum length sequences (MLS) and iterative randomized stimulation and averaging (I-RSA). ABRs were obtained to click stimuli in six bottlenose dolphins (Tursiops truncatus). In experiment 1, click level was held constant and click rate varied from 25 to 1250 Hz. For MLS, interstimulus intervals varied by a factor of 6 at each rate, while for I-RSA the interstimulus intervals varied by ± 0.5 ms regardless of rate. In experiment 2, stimulus rates ranged from 100 to 1000 Hz and click level varied from 105 to 135 dB re: 1 μPa. For experiment 1, MLS and I-RSA showed similar decreases in ABR peak amplitudes and increases in ABR peak latencies and interwave intervals with increasing rate. For experiment 2, there was an increase in peak latency and a decrease in peak amplitude with decreasing click level; however, the effects of click level were reduced at higher rates. The results indicate that the greater jitter for MLS compared to I-RSA does not substantially affect the dolphin ABR.
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July 2018
July 18 2018
Comparison of maximum length sequence and randomized stimulation and averaging methods on the bottlenose dolphin auditory brainstem responsea)
Robert Burkard;
Robert Burkard
b)
Department of Rehabilitation Science, University at Buffalo
, 626 Kimball Tower, Buffalo, New York 14214, USA
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James J. Finneran;
James J. Finneran
United States Navy Marine Mammal Program, Space and Naval Warfare Systems Center Pacific
, Code 71510, 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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b)
Electronic mail: rfb@buffalo.edu
a)
Portions of these data were presented at the 2017 meeting of the International Electric Response Audiometry Study Group (IERASG) in Warsaw, Poland, May, 2017.
J. Acoust. Soc. Am. 144, 308–318 (2018)
Article history
Received:
March 25 2018
Accepted:
June 25 2018
Citation
Robert Burkard, James J. Finneran, Jason Mulsow; Comparison of maximum length sequence and randomized stimulation and averaging methods on the bottlenose dolphin auditory brainstem response. J. Acoust. Soc. Am. 1 July 2018; 144 (1): 308–318. https://doi.org/10.1121/1.5046069
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