Document Detail


Auditory fovea and Doppler shift compensation: adaptations for flutter detection in echolocating bats using CF-FM signals.
MedLine Citation:
PMID:  20857119     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Rhythmical modulations in insect echoes caused by the moving wings of fluttering insects are behaviourally relevant information for bats emitting CF-FM signals with a high duty cycle. Transmitter and receiver of the echolocation system in flutter detecting foragers are especially adapted for the processing of flutter information. The adaptations of the transmitter are indicated by a flutter induced increase in duty cycle, and by Doppler shift compensation (DSC) that keeps the carrier frequency of the insect echoes near a reference frequency. An adaptation of the receiver is the auditory fovea on the basilar membrane, a highly expanded frequency representation centred to the reference frequency. The afferent projections from the fovea lead to foveal areas with an overrepresentation of sharply tuned neurons with best frequencies near the reference frequency throughout the entire auditory pathway. These foveal neurons are very sensitive to stimuli with natural and simulated flutter information. The frequency range of the foveal areas with their flutter processing neurons overlaps exactly with the frequency range where DS compensating bats most likely receive echoes from fluttering insects. This tight match indicates that auditory fovea and DSC are adaptations for the detection and evaluation of insects flying in clutter.
Authors:
Hans-Ulrich Schnitzler; Annette Denzinger
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Publication Detail:
Type:  Journal Article     Date:  2010-09-21
Journal Detail:
Title:  Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology     Volume:  197     ISSN:  1432-1351     ISO Abbreviation:  J. Comp. Physiol. A Neuroethol. Sens. Neural. Behav. Physiol.     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-04-19     Completed Date:  -     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:  541-59     Citation Subset:  IM    
Affiliation:
Animal Physiology, Institute of Neurobiology, University of Tuebingen, Auf der Morgenstelle 28, 72076, Tübingen, Germany, hans-ulrich.schnitzler@uni-tuebingen.de.
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