Document Detail


Improving consonant intelligibility for Ineraid patients fit with continuous interleaved sampling (CIS) processors by enhancing contrast among channel outputs.
MedLine Citation:
PMID:  8862968     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: In Experiment 1 the objective was to determine whether patients who have been implanted with the Ineraid electrode array perform better on tests of consonant identification when signals are processed through a continuous interleaved sampling (CIS) processor than when signals are processed through an analogue (Ineraid) processor. In Experiment 2 the objective was to determine, for patients using the CIS strategy, whether identification accuracy for stop consonant place of articulation could be improved by enhancing differences in the patterns of the signal processor channel outputs. DESIGN: In Experiment 1, 16 consonants were presented in VCV format for identification. In Experiment 1 the CIS patients evidence difficulty in identifying /p t k/. Therefore, in Experiment 2 the voiceless stop consonants were presented in two stimulus conditions. In one, the stimuli were unfiltered. In the other, the stimuli were individually filtered so as to enhance the differences in channel outputs for /p/, /t/, and /k/. RESULTS: In Experiment 1 the patients performed better with CIS processors than with analogue processors. In Experiment 2 the "enhanced" stimuli were identified with better accuracy than were the unfiltered stimuli. CONCLUSIONS: We confirm that Ineraid patients achieve higher scores on tests of consonant identification when using a CIS processor than when using an analogue processor. Errors in identification of stop consonant place of articulation, when using a CIS processor, are due to the similarity in the patterns of the processor's channel outputs. By showing that consonant intelligibility can be improved by filtering, we show that we have not reached the limit of speech understanding that can be supported by the population of neural elements remaining in our patients' auditory systems.
Authors:
M F Dorman; P C Loizou
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Ear and hearing     Volume:  17     ISSN:  0196-0202     ISO Abbreviation:  Ear Hear     Publication Date:  1996 Aug 
Date Detail:
Created Date:  1996-12-31     Completed Date:  1996-12-31     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8005585     Medline TA:  Ear Hear     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  308-13     Citation Subset:  IM    
Affiliation:
Department of Speech and Hearing Science, Arizona State University, Tempe 85287-0102, USA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Equipment Design
Hearing Aids
Humans
Middle Aged
Phonetics*
Speech Perception*
Grant Support
ID/Acronym/Agency:
DC00654-05/DC/NIDCD NIH HHS

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


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