| Bats' avoidance of real and virtual objects: Implications for the sonar coding of object size. | |
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MedLine Citation:
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PMID: 22085788 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Fast movement in complex environments requires the controlled evasion of obstacles. Sonar-based obstacle evasion involves analysing the acoustic features of object-echoes (e.g., echo amplitude) that correlate with this object's physical features (e.g., object size). Here, we investigated sonar-based obstacle evasion in bats emerging in groups from their day roost. Using video-recordings, we first show that the bats evaded a small real object (ultrasonic loudspeaker) despite the familiar flight situation. Secondly, we studied the sonar coding of object size by adding a larger virtual object. The virtual object echo was generated by real-time convolution of the bats' calls with the acoustic impulse response of a large spherical disc and played from the loudspeaker. Contrary to the real object, the virtual object did not elicit evasive flight, despite the spectro-temporal similarity of real and virtual object echoes. Yet, their spatial echo features differ: virtual object echoes lack the spread of angles of incidence from which the echoes of large objects arrive at a bat's ears (sonar aperture). We hypothesise that this mismatch of spectro-temporal and spatial echo features caused the lack of virtual object evasion and suggest that the sonar aperture of object echoscapes contributes to the sonar coding of object size. |
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Authors:
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Holger R Goerlitz; Daria Genzel; Lutz Wiegrebe |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-11-11 |
Journal Detail:
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Title: Behavioural processes Volume: - ISSN: 1872-8308 ISO Abbreviation: - Publication Date: 2011 Nov |
Date Detail:
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Created Date: 2011-11-16 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7703854 Medline TA: Behav Processes Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011. Published by Elsevier B.V. |
Affiliation:
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Neurobiology, Dept. Biology II, Ludwig-Maximilians-University Munich, Großhadernerstraße 2, 82152 Martinsried, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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