Document Detail

The MOC Reflex during Active Listening to Speech.
MedLine Citation:
PMID:  21862678     Owner:  NLM     Status:  Publisher    
PURPOSE: The purpose of this study was to test the hypothesis that active listening to speech would increase MOC efferent activity for the right versus left ear. Methods CEOAEs were evoked by 60 dB p.e. SPL clicks in 13 normally hearing adults in four test conditions for each ear: 1) in quiet; 2) with 60 dB SPL contralateral broadband noise; 3) with words embedded (at -3 dB SNR) in 60 dB SPL contralateral noise during which listeners directed attention to the words; and 4) for the same SNR as in condition #3, with words played backwards. RESULTS: There was greater suppression during active listening compared to passive listening that was apparent in the latency range of 6-18 ms post stimulus onset. Ear differences in CEOAE amplitude were observed in all conditions, with right ear amplitudes larger than those for the left. The absolute difference between CEOAE amplitude in quiet and with contralateral noise, a metric of suppression, was equivalent for right and left ears. When the amplitude differences were normalized, suppression was greater for noise presented to the right and the effect measured for a probe in the left ear. CONCLUSIONS: The findings support the theory that cortical mechanisms involved in listening to speech affect cochlear function through the medial olivocochlear efferent system.
Angela C Garinis; Theodore Glattke; Barbara K Cone
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-23
Journal Detail:
Title:  Journal of speech, language, and hearing research : JSLHR     Volume:  -     ISSN:  1558-9102     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-8-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9705610     Medline TA:  J Speech Lang Hear Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Speech, Language and Hearing Sciences, University of Arizona, Tucson, AZ.
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