Auditory brainstem response recovery rates during double‐pulse presentation in the false killer whale (Pseudorca crassidens): A mechanism of automatic gain control?

2006 ◽  
Vol 120 (5) ◽  
pp. 3227-3227
Author(s):  
Paul E. Nachtigall ◽  
Alexander Ya. Supin ◽  
Marlee Breese
Keyword(s):  
Auditory Brainstem Response ◽  
Killer Whale ◽  
Automatic Gain Control ◽  
Gain Control ◽  
Auditory Brainstem ◽  
Double Pulse ◽  
Response Recovery ◽  
False Killer Whale ◽  
Brainstem Response ◽  
Pseudorca Crassidens

Evoked‐potential study of automatic gain control in the sonar of a false killer whale

2004 ◽  
Vol 116 (4) ◽  
pp. 2554-2554
Author(s):  
Alexander Supin ◽  
Paul Nachtigall ◽  
Whitlow Au ◽  
Marlee Breese
Keyword(s):  
Evoked Potential ◽  
Killer Whale ◽  
Automatic Gain Control ◽  
Gain Control ◽  
Potential Study ◽  
False Killer Whale

Killer whale (Orcinus orca) hearing: Auditory brainstem response and behavioral audiograms

1999 ◽  
Vol 106 (2) ◽  
pp. 1134-1141 ◽  
Author(s):  
Michael D. Szymanski ◽  
David E. Bain ◽  
Kent Kiehl ◽  
Scott Pennington ◽  
Scott Wong ◽  
...  
Keyword(s):  
Auditory Brainstem Response ◽  
Killer Whale ◽  
Auditory Brainstem ◽  
Orcinus Orca ◽  
Brainstem Response

scholarly journals Keeping returns optimal: gain control exerted through sensitivity adjustments in the harbour porpoise auditory system

2012 ◽  
Vol 279 (1736) ◽  
pp. 2237-2245 ◽  
Author(s):  
Meike Linnenschmidt ◽  
Kristian Beedholm ◽  
Magnus Wahlberg ◽  
Jakob Højer-Kristensen ◽  
Paul E. Nachtigall
Keyword(s):  
Dynamic Range ◽  
Automatic Gain Control ◽  
Energy Levels ◽  
Gain Control ◽  
Auditory Brainstem ◽  
Sound Level ◽  
Harbour Porpoise ◽  
Fourth Power ◽  
Target Range ◽  
Brainstem Response

Animals that use echolocation (biosonar) listen to acoustic signals with a large range of intensities, because echo levels vary with the fourth power of the animal's distance to the target. In man-made sonar, engineers apply automatic gain control to stabilize the echo energy levels, thereby rendering them independent of distance to the target. Both toothed whales and bats vary the level of their echolocation clicks to compensate for the distance-related energy loss. By monitoring the auditory brainstem response (ABR) during a psychophysical task, we found that a harbour porpoise ( Phocoena phocoena ), in addition to adjusting the sound level of the outgoing signals up to 5.4 dB, also reduces its ABR threshold by 6 dB when the target distance doubles. This self-induced threshold shift increases the dynamic range of the biosonar system and compensates for half of the variation of energy that is caused by changes in the distance to the target. In combination with an increased source level as a function of target range, this helps the porpoise to maintain a stable echo-evoked ABR amplitude irrespective of target range, and is therefore probably an important tool enabling porpoises to efficiently analyse and classify received echoes.

Auditory brainstem response in the lesser scaup, a species of diving duck

2010 ◽  
Author(s):  
Sara C. Therrien ◽  
Catherine E. Carr ◽  
Elizabeth F. Brittan-Powell ◽  
Alicia M. Wells-Berlin
Keyword(s):  
Auditory Brainstem Response ◽  
Auditory Brainstem ◽  
Diving Duck ◽  
Lesser Scaup ◽  
Brainstem Response
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