Document Detail


Binaural processing by the gecko auditory periphery.
MedLine Citation:
PMID:  21325679     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Lizards have highly directional ears, owing to strong acoustical coupling of the eardrums and almost perfect sound transmission from the contralateral ear. To investigate the neural processing of this remarkable tympanic directionality, we combined biophysical measurements of eardrum motion in the Tokay gecko with neurophysiological recordings from the auditory nerve. Laser vibrometry shows that their ear is a two-input system with approximately unity interaural transmission gain at the peak frequency (∼ 1.6 kHz). Median interaural delays are 260 μs, almost three times larger than predicted from gecko head size, suggesting interaural transmission may be boosted by resonances in the large, open mouth cavity (Vossen et al. 2010). Auditory nerve recordings are sensitive to both interaural time differences (ITD) and interaural level differences (ILD), reflecting the acoustical interactions of direct and indirect sound components at the eardrum. Best ITD and click delays match interaural transmission delays, with a range of 200-500 μs. Inserting a mold in the mouth cavity blocks ITD and ILD sensitivity. Thus the neural response accurately reflects tympanic directionality, and most neurons in the auditory pathway should be directional.
Authors:
Jakob Christensen-Dalsgaard; Yezhong Tang; Catherine E Carr
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2011-02-16
Journal Detail:
Title:  Journal of neurophysiology     Volume:  105     ISSN:  1522-1598     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-05-18     Completed Date:  2012-04-17     Revised Date:  2013-06-30    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1992-2004     Citation Subset:  IM    
Affiliation:
Institute of Biology, University of Southern Denmark, Odense, Denmark.
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MeSH Terms
Descriptor/Qualifier:
Acoustic Stimulation / methods*
Animals
Auditory Pathways / physiology
Auditory Perception / physiology*
Cochlear Nerve / physiology*
Ear, Middle / physiology
Female
Lizards / anatomy & histology,  physiology*
Male
Sound Localization / physiology*
Vibration*
Grant Support
ID/Acronym/Agency:
DC-00436/DC/NIDCD NIH HHS; P30-DC-0466/DC/NIDCD NIH HHS
Comments/Corrections

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