Document Detail


Spatial unmasking in the echolocating Big Brown Bat, Eptesicus fuscus.
MedLine Citation:
PMID:  19263055     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Masking affects the ability of echolocating bats to detect a target in the presence of clutter targets. It can be reduced by spatially separating the targets. Spatial unmasking was measured in a two-alternative-forced-choice detection experiment with four Big Brown Bats detecting a wire at 1 m distance. Depth dependent spatial unmasking was investigated by the bats detecting a wire with a diameter of 1.2 mm in front of a masker with a threshold distance of 11 cm behind the wire. For angle dependent spatial unmasking the masker was turned laterally, starting from its threshold position at 11 cm. With increasing masker angles the bats could detect thinner wires with diameters decreasing from 1.2 mm (target strength -36.8 dB) at 0 degrees to 0.2 mm (target strength -63.0 dB) at 22 degrees. Without masker, the bats detected wire diameters of 0.16 mm (target strength -66.2 dB), reached with masker positions beyond 23 degrees (complete masking release). Analysis of the sonar signals indicated strategies in the echolocation behavior. The bats enhanced the second harmonics of their signals. This may improve the spatial separation between wire and masker due to frequency-dependent directionality increase of sound emission and echo reception.
Authors:
Susan Sümer; Annette Denzinger; Hans-Ulrich Schnitzler
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-03-05
Journal Detail:
Title:  Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology     Volume:  195     ISSN:  1432-1351     ISO Abbreviation:  J. Comp. Physiol. A Neuroethol. Sens. Neural. Behav. Physiol.     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-04-28     Completed Date:  2009-05-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101141792     Medline TA:  J Comp Physiol A Neuroethol Sens Neural Behav Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  463-72     Citation Subset:  IM    
Affiliation:
Lehrstuhl Tierphysiologie, Zoologisches Institut, Universität Tübingen, Auf der Morgenstelle 28, 72076, Tübingen, Germany. susan.suemer@googlemail.com
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MeSH Terms
Descriptor/Qualifier:
Acoustics
Animals
Chiroptera / physiology*
Depth Perception / physiology
Echolocation / physiology*
Perceptual Masking / physiology*
Spatial Behavior
Vocalization, Animal / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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