| Changes in consistency patterns of click frequency content over time of an echolocating Atlantic bottlenose dolphin. | |
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MedLine Citation:
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PMID: 20550280 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Echolocation clicks were recorded from an Atlantic bottlenose dolphin Tursiops truncatus trained to discriminate frequency filtered phantom targets in 1998 and in 2004. These clicks showed consistency within their spectra intensity profiles but only in a certain band of frequencies. In 2004 almost all the clicks were consistent within the 0-42 kHz band regardless of the presented target or the click source level. This region corresponded with previous data showing that in 2004 the dolphin perceived frequencies only from within the 29-42 kHz band during echolocation. Above 42 kHz the consistency was lost. In 1998 the consistent region was found only in the 90-100 kHz band showing a shift had occurred with time. This suggests the dolphin's echolocation strategy for these discrimination tasks centered on the use of clicks with the same controlled standard frequency content in a certain frequency band to investigate different targets. This consistent region shifted over time to maintain maximum signal to noise ratio of the echoes given certain changing limitations to the echolocation system. The shift in consistency over time indicates these consistent regions were not simply artifacts of click production but rather an active control of frequency content. |
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Authors:
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Stuart D Ibsen; Whitlow W L Au; Paul E Nachtigall; Caroline M DeLong; Marlee Breese |
Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 127 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-06-16 Completed Date: 2010-10-19 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 3821-9 Citation Subset: IM |
Affiliation:
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Marine Mammal Research Program, Hawaii Institute of Marine Biology, PO Box 1106, Kailua, Hawaii 96734-1106, USA. sibsen@ucsd.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustics Animals Bottle-Nosed Dolphin* Discrimination (Psychology) Echolocation* Environment Female Hawaii Psychological Tests Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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