Document Detail

Dynamics of acoustic reflex growth.
MedLine Citation:
PMID:  7213199     Owner:  NLM     Status:  MEDLINE    
Acoustic reflex growth was measured as a function of activator bandwidth in 10 subjects with normal hearing and in 5 subjects with different configurations of sensorineural hearing loss. The activators consisted of tones with frequencies of 500, 1 000 and 4 000 Hz, fractions and multiples of octave bands centered at these frequencies, and broadband noise. Growth functions for the normal-hearing subjects measured with a 660-Hz probe tone had smaller peak magnitudes and shallower slopes than the growth functions measured with a 220-Hz probe tone. The slope of the growth function and the peak magnitude of acoustic impedance were not affected in any consistent manner by activator bandwidth or activator center frequency. The dynamic range of the growth function increased with an increase in activator bandwidth beyond 1 octave. The resistive component of acoustic impedance did not exhibit a consistent pattern of change with increasing activator intensity level. The reflex growth functions for normal-hearing subjects separated into two groups, those with steep slopes and large peak magnitudes and those with shallow slopes and small peak magnitudes. 3 out of the 5 cases with sensorineural hearing loss presented growth functions with shallower slopes, smaller dynamic ranges and smaller peak magnitudes than normal. The other 2 cases had steeper slopes and larger peak magnitudes than normal. The dynamic range did not increase with an increase in activator bandwidth beyond 1 octave. The differences in reflex growth functions with probe-tone frequency observed for the normal group were diminished or absent in 4 of the 5 cases of sensorineural hearing loss. The frequency of 4 000 Hz appeared to be the most sensitive to reflex manifestations of hearing loss.
B H Sprague; T L Wiley; M G Block
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Audiology : official organ of the International Society of Audiology     Volume:  20     ISSN:  0020-6091     ISO Abbreviation:  Audiology     Publication Date:  1981  
Date Detail:
Created Date:  1981-05-21     Completed Date:  1981-05-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  1273752     Medline TA:  Audiology     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  15-40     Citation Subset:  IM    
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MeSH Terms
Acoustic Impedance Tests
Acoustic Stimulation
Auditory Threshold / physiology
Hearing / physiology
Hearing Loss, Sensorineural / diagnosis,  physiopathology*
Middle Aged
Reflex, Acoustic*
Stapes / physiology

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

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