| Contribution of various frequency bands to ABR in dolphins. | |
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MedLine Citation:
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PMID: 11124470 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Auditory brainstem responses (ABR) to clicks and noise bursts of various frequency bands and intensities were recorded in two bottlenosed dolphins, Tursiops truncatus. The purpose was to assess contributions of various parts of the cochlear partition to ABR and travelling wave velocity in the cochlea. At band-pass filtered stimuli (1-0.25 oct wide), ABR amplitude increased with increasing stimulus frequency, thus indicating higher contribution of basal cochlear parts. At high-pass and low-pass filtered stimuli, ABR amplitude increased with passband widening. However, the sum of all narrow-band contributions was a waveform of higher amplitude than the real ABR evoked by the wide-band stimulus. Applying a correction based on an assumption that the 'internal spectrum' is about 0.4 oct wider than the nominal stimulus spectrum resulted in the sum of narrow-band contributions equal to the wide-band ABR. The travelling wave velocity was computed based on ABR latencies and assigned a frequency of 128 kHz to the basal end of the cochlea. The computation gave values from 38.2 oct/ms at the proximal end of the basilar membrane to 4.0 oct/ms at a distance of 3.25 oct (13.5 kHz). |
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Authors:
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V V Popov; A Y Supin |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Hearing research Volume: 151 ISSN: 0378-5955 ISO Abbreviation: Hear. Res. Publication Date: 2001 Jan |
Date Detail:
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Created Date: 2001-01-26 Completed Date: 2001-03-08 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7900445 Medline TA: Hear Res Country: Netherlands |
Other Details:
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Languages: eng Pagination: 250-260 Citation Subset: IM |
Affiliation:
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Institute of Ecology and Evolution of the Russian Academy of Sciences, 33 Leninsky Prosp., 117071, Moscow, Russia |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation Animals Cochlea / physiology Dolphins / physiology* Evoked Potentials, Auditory, Brain Stem / physiology* Female Male Noise |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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