Document Detail


Relationship between gap detection thresholds and loudness in cochlear-implant users.
MedLine Citation:
PMID:  21168479     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Gap detection threshold (GDT) is a commonly used measure of temporal acuity in cochlear-implant (CI) recipients. This measure, like other measures of temporal acuity, shows considerable variation across subjects and also varies across stimulation sites within subjects. The aims of this study were (1) to determine whether across-site variation in GDTs would be reduced or maintained with increased stimulation levels; (2) to determine whether across-site variation in GDTs at low stimulation levels was related to differences in loudness percepts at those same levels; and (3) to determine whether matching loudness levels could reduce across-site differences in GDTs. Thresholds and maximum comfortable loudness levels were measured in postlingually deaf adults using all available sites in their electrode arrays. All sites were then surveyed at 30% of the dynamic range (DR) to examine across-site variation. Two sites with the largest difference in GDTs were then selected and for those two sites GDTs were measured at multiple levels of the DR (10%, 30%, 50%, 70%, and 90%). Stimuli consisted of 500 ms trains of symmetric-biphasic pulses, 40 μs/phase, presented at a rate of 1000 pps using a monopolar (MP1+2) electrode configuration. To examine perceptual differences in loudness, the selected sites were loudness-matched at the same levels of the DR. Variations in GDTs and loudness patterns were observed across stimulation sites and across subjects. Variations in GDTs across sites tended to decrease with increasing stimulation levels. For the majority of the subjects, stimuli at a given level in %DR were perceived louder at sites with better GDTs than those presented at the same level in %DR at sites with poorer GDTs. These results suggest that loudness is a contributing factor to across-site variation in GDTs and that CI fittings based on more detailed loudness matching could reduce across-site variation and improve perceptual acuity.
Authors:
Soha N Garadat; Bryan E Pfingst
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2010-12-17
Journal Detail:
Title:  Hearing research     Volume:  275     ISSN:  1878-5891     ISO Abbreviation:  Hear. Res.     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-05-16     Completed Date:  2011-09-14     Revised Date:  2014-09-14    
Medline Journal Info:
Nlm Unique ID:  7900445     Medline TA:  Hear Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  130-8     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier B.V. All rights reserved.
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MeSH Terms
Descriptor/Qualifier:
Aged
Auditory Threshold / physiology
Cochlear Implantation / methods*
Cochlear Implants*
Deafness / therapy*
Electrodes
Female
Hearing
Humans
Loudness Perception
Male
Middle Aged
Psychophysics
Software
Speech Perception
Grant Support
ID/Acronym/Agency:
F32 DC010318/DC/NIDCD NIH HHS; F32 DC010318/DC/NIDCD NIH HHS; F32 DC010318-01/DC/NIDCD NIH HHS; F32 DC010318-02/DC/NIDCD NIH HHS; R01 DC004312/DC/NIDCD NIH HHS; R01 DC004312/DC/NIDCD NIH HHS; R01 DC004312-10/DC/NIDCD NIH HHS; R01 DC010786/DC/NIDCD NIH HHS; R01 DC010786/DC/NIDCD NIH HHS; R01 DC010786-01/DC/NIDCD NIH HHS; T32 DC000011/DC/NIDCD NIH HHS; T32 DC000011-32/DC/NIDCD NIH HHS; T32 DC00011/DC/NIDCD NIH HHS
Comments/Corrections

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