Document Detail


Feedback control of the auditory periphery: anti-masking effects of middle ear muscles vs. olivocochlear efferents.
MedLine Citation:
PMID:  9836136     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Both MEM and MOC systems are sound-evoked reflexes to the auditory periphery which can be elicited by sound in either ear. Both MEM and MOC systems can increase thresholds in the auditory periphery: the MEM system acts by stiffening the ossicular chain, the MOC system by decreasing outer hair cell amplification of sound-induced motion in the inner ear. MEM-induced attenuations are largest for low frequency stimuli, MOC-induced attenuations are largest for mid- to high-frequency sounds. Both MEM and MOC systems can have anti-masking effects. The MEM reflex can decrease the masking of high-frequency signals by low-frequency noise (i.e., the upward spread of masking). The MOC reflex is complementary in that it minimizes masking of high-frequency transient signals by high-frequency continuous noise. MEM anti-masking arises by reducing suppressive masking and can improve masked thresholds at high frequencies. MOC anti-masking arises by counteracting excitatory masking. It does not improve masked thresholds, but can improve the detectability of small suprathreshold intensity increments. Anti-masking effects of both MEM and MOC systems should be reduced in cases of sensorineural hearing loss.
Authors:
M C Liberman; J J Guinan
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of communication disorders     Volume:  31     ISSN:  0021-9924     ISO Abbreviation:  J Commun Disord     Publication Date:    1998 Nov-Dec
Date Detail:
Created Date:  1999-02-22     Completed Date:  1999-02-22     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0260316     Medline TA:  J Commun Disord     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  471-82; quiz 483; 553     Citation Subset:  IM    
Affiliation:
Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston, USA. mcl@epl.meei.harvard.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Cats
Cochlea / physiology*
Ear, Middle / physiology*
Feedback*
Humans
Noise / adverse effects
Perceptual Masking*
Reflex / physiology
Stapedius / physiology
Grant Support
ID/Acronym/Agency:
P01 DC00119/DC/NIDCD NIH HHS; R01 DC00188/DC/NIDCD NIH HHS; R01 DC00235/DC/NIDCD NIH HHS

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


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