Time-varying auditory gain control in response to double-pulse stimuli in harbour porpoises is not mediated by a stapedial reflex
Echolocating animals reduce their output level and hearing sensitivity with decreasing echo delays, presumably to stabilize the perceived echo intensity during target approaches. In bats, this variation in hearing sensitivity is formed by a call-induced stapedial reflex that tapers off over time aft...
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ftmurdochuniv:oai:researchrepository.murdoch.edu.au:36587 2023-05-15T16:33:25+02:00 Time-varying auditory gain control in response to double-pulse stimuli in harbour porpoises is not mediated by a stapedial reflex Schrøder, A.E.M. Beedholm, K. Madsen, P.T. 2017 https://researchrepository.murdoch.edu.au/id/eprint/36587/ eng eng The Company of Biologists https://researchrepository.murdoch.edu.au/id/eprint/36587/ full_text_status:public Schrøder, A.E.M., Beedholm, K. and Madsen, P.T. <https://researchrepository.murdoch.edu.au/view/author/Madsen, Peter.html> (2017) Time-varying auditory gain control in response to double-pulse stimuli in harbour porpoises is not mediated by a stapedial reflex. Biology Open, 6 (4). pp. 525-529. Journal Article 2017 ftmurdochuniv 2020-01-05T18:59:00Z Echolocating animals reduce their output level and hearing sensitivity with decreasing echo delays, presumably to stabilize the perceived echo intensity during target approaches. In bats, this variation in hearing sensitivity is formed by a call-induced stapedial reflex that tapers off over time after the call. Here, we test the hypothesis that a similar mechanism exists in toothed whales by subjecting a trained harbour porpoise to a series of double sound pulses varying in delay and frequency, while measuring the magnitudes of the evoked auditory brainstem responses (ABRs). We find that the recovery of the ABR to the second pulse is frequency dependent, and that a stapedial reflex therefore cannot account for the reduced hearing sensitivity at short pulse delays. We propose that toothed whale auditory time-varying gain control during echolocation is not enabled by the middle ear as in bats, but rather by frequency-dependent mechanisms such as forward masking and perhaps higher-order control of efferent feedback to the outer hair cells. Article in Journal/Newspaper Harbour porpoise toothed whale toothed whales Murdoch University: Murdoch Research Repository |
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Murdoch University: Murdoch Research Repository |
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language |
English |
description |
Echolocating animals reduce their output level and hearing sensitivity with decreasing echo delays, presumably to stabilize the perceived echo intensity during target approaches. In bats, this variation in hearing sensitivity is formed by a call-induced stapedial reflex that tapers off over time after the call. Here, we test the hypothesis that a similar mechanism exists in toothed whales by subjecting a trained harbour porpoise to a series of double sound pulses varying in delay and frequency, while measuring the magnitudes of the evoked auditory brainstem responses (ABRs). We find that the recovery of the ABR to the second pulse is frequency dependent, and that a stapedial reflex therefore cannot account for the reduced hearing sensitivity at short pulse delays. We propose that toothed whale auditory time-varying gain control during echolocation is not enabled by the middle ear as in bats, but rather by frequency-dependent mechanisms such as forward masking and perhaps higher-order control of efferent feedback to the outer hair cells. |
format |
Article in Journal/Newspaper |
author |
Schrøder, A.E.M. Beedholm, K. Madsen, P.T. |
spellingShingle |
Schrøder, A.E.M. Beedholm, K. Madsen, P.T. Time-varying auditory gain control in response to double-pulse stimuli in harbour porpoises is not mediated by a stapedial reflex |
author_facet |
Schrøder, A.E.M. Beedholm, K. Madsen, P.T. |
author_sort |
Schrøder, A.E.M. |
title |
Time-varying auditory gain control in response to double-pulse stimuli in harbour porpoises is not mediated by a stapedial reflex |
title_short |
Time-varying auditory gain control in response to double-pulse stimuli in harbour porpoises is not mediated by a stapedial reflex |
title_full |
Time-varying auditory gain control in response to double-pulse stimuli in harbour porpoises is not mediated by a stapedial reflex |
title_fullStr |
Time-varying auditory gain control in response to double-pulse stimuli in harbour porpoises is not mediated by a stapedial reflex |
title_full_unstemmed |
Time-varying auditory gain control in response to double-pulse stimuli in harbour porpoises is not mediated by a stapedial reflex |
title_sort |
time-varying auditory gain control in response to double-pulse stimuli in harbour porpoises is not mediated by a stapedial reflex |
publisher |
The Company of Biologists |
publishDate |
2017 |
url |
https://researchrepository.murdoch.edu.au/id/eprint/36587/ |
genre |
Harbour porpoise toothed whale toothed whales |
genre_facet |
Harbour porpoise toothed whale toothed whales |
op_source |
Schrøder, A.E.M., Beedholm, K. and Madsen, P.T. <https://researchrepository.murdoch.edu.au/view/author/Madsen, Peter.html> (2017) Time-varying auditory gain control in response to double-pulse stimuli in harbour porpoises is not mediated by a stapedial reflex. Biology Open, 6 (4). pp. 525-529. |
op_relation |
https://researchrepository.murdoch.edu.au/id/eprint/36587/ full_text_status:public |
_version_ |
1766023107168960512 |