Biosonar echo delay resolution was investigated in four bottlenose dolphins (Tursiops truncatus) using a “jittered” echo paradigm, where dolphins discriminated between electronic echoes with fixed delay and those whose delay alternated (jittered) on successive presentations. The dolphins performed an echo-change detection task and produced a conditioned acoustic response when detecting a change from non-jittering echoes to jittering echoes. Jitter delay values ranged from 0 to 20 μs. A passive listening task was also conducted, where dolphins listened to simulated echoes and produced a conditioned acoustic response when signals changed from non-jittering to jittering. Results of the biosonar task showed a mean jitter delay threshold of 1.3 μs and secondary peaks in error functions suggestive of the click autocorrelation function. When echoes were jittered in polarity and delay, error functions shifted by approximately 5 μs and all dolphins discriminated echoes that jittered only in polarity. Results were qualitatively similar to those from big brown bats (Eptesicus fuscus) and indicate that the dolphin biosonar range estimator is sensitive to echo phase information. Results of the passive listening task suggested that the dolphins could not passively detect changes in timing and polarity of simulated echoes.
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July 2020
July 27 2020
Dolphin echo-delay resolution measured with a jittered-echo paradigm
James J. Finneran
;
James J. Finneran
a)
1
United States Navy Marine Mammal Program, Naval Information Warfare Center Pacific Code
56710, 53560 Hull Street, San Diego, California 92152, USA
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Ryan Jones;
Ryan Jones
b)
2
National Marine Mammal Foundation
, 2240 Shelter Island Drive #200; San Diego, California 92106, USA
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Regina A. Guazzo
;
Regina A. Guazzo
c)
3
Naval Information Warfare Center Pacific Code 56720
, 53560 Hull Street, San Diego, California 92152, USA
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Madelyn G. Strahan
;
Madelyn G. Strahan
d)
2
National Marine Mammal Foundation
, 2240 Shelter Island Drive #200; San Diego, California 92106, USA
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Jason Mulsow;
Jason Mulsow
2
National Marine Mammal Foundation
, 2240 Shelter Island Drive #200; San Diego, California 92106, USA
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Dorian S. Houser
;
Dorian S. Houser
e)
2
National Marine Mammal Foundation
, 2240 Shelter Island Drive #200; San Diego, California 92106, USA
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Brian K. Branstetter;
Brian K. Branstetter
2
National Marine Mammal Foundation
, 2240 Shelter Island Drive #200; San Diego, California 92106, USA
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Patrick W. Moore
Patrick W. Moore
2
National Marine Mammal Foundation
, 2240 Shelter Island Drive #200; San Diego, California 92106, USA
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J. Acoust. Soc. Am. 148, 374–388 (2020)
Article history
Received:
April 25 2020
Accepted:
July 02 2020
Citation
James J. Finneran, Ryan Jones, Regina A. Guazzo, Madelyn G. Strahan, Jason Mulsow, Dorian S. Houser, Brian K. Branstetter, Patrick W. Moore; Dolphin echo-delay resolution measured with a jittered-echo paradigm. J. Acoust. Soc. Am. 1 July 2020; 148 (1): 374–388. https://doi.org/10.1121/10.0001604
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