Document Detail


Vowel identification by listeners with hearing impairment in response to variation in formant frequencies.
MedLine Citation:
PMID:  21297168     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: This study examined the influence of presentation level and mild-to-moderate hearing loss on the identification of a set of vowel tokens systematically varying in the frequency locations of their second and third formants.
METHOD: Five listeners with normal hearing (NH listeners) and five listeners with hearing impairment (HI listeners) identified synthesized vowels that represented both highly identifiable and ambiguous examples of /i/, /[Please see symbol]/, and /[Please see symbol]/.
RESULTS: Response patterns of NH listeners showed significant changes, with an increase in presentation level from 75 dB SPL to 95 dB SPL, including increased category overlap. HI listeners, listening only at the higher level, showed greater category overlap than normal and overall identification patterns that differed significantly from those of NH listeners. Excitation patterns based on estimates of auditory filters suggested smoothing of the internal representations, resulting in impaired formant resolution.
CONCLUSIONS: Both increased presentation level for NH listeners and the presence of hearing loss produced a significant change in vowel identification for this stimulus set. Major differences were observed between NH listeners and HI listeners in vowel category overlap and in the sharpness of boundaries between vowel tokens. It is likely that these findings reflect imprecise internal spectral representations due to reduced frequency selectivity.
Authors:
Michelle R Molis; Marjorie R Leek
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-02-04
Journal Detail:
Title:  Journal of speech, language, and hearing research : JSLHR     Volume:  54     ISSN:  1558-9102     ISO Abbreviation:  J. Speech Lang. Hear. Res.     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-08-02     Completed Date:  2011-12-28     Revised Date:  2014-09-13    
Medline Journal Info:
Nlm Unique ID:  9705610     Medline TA:  J Speech Lang Hear Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1211-23     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Acoustic Impedance Tests
Adult
Aged
Aged, 80 and over
Analysis of Variance
Auditory Perception*
Auditory Threshold*
Case-Control Studies
Female
Hearing Loss, Sensorineural / physiopathology*
Humans
Male
Middle Aged
Models, Biological
Phonetics*
Psychoacoustics
Reference Values
Sound Spectrography
Speech Perception*
Grant Support
ID/Acronym/Agency:
R01 DC000626/DC/NIDCD NIH HHS; R01 DC000626-23/DC/NIDCD NIH HHS; R01DC 00626/DC/NIDCD NIH HHS
Comments/Corrections

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


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