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Intelligibility of speech produced by children with hearing loss : conventional amplification versus nonlinear frequency compression in hearing aids
Ching, Teresa Y. C
;
Rattanasone, Nan Xu
;
Macdonald, Gretel
;
Zhang, Vicky W
;
Button, Laura
;
Demuth, Katherine
. - : OMICS International, 2015
Abstract:
Objective: This study aimed to 1) investigate the influence of nonlinear frequency compression (NLFC) in hearing aids on intelligibility of speech produced by children with hearing loss; and 2) examine whether clinicians’ or parents’ judgments might be correlated with those of inexperienced listeners. Methods: Twenty-seven adult listeners with normal hearing who reported no experience listening to speech produced by people with hearing loss were asked to judge the intelligibility of speech samples of eight hearing-impaired children under four aided conditions. Also, the parents and the clinicians who provided services to the children provided ratings. The children were enrolled in a four-period multi-site trial that was aimed to compare the effects of conventional processing with NLFC in hearing aids on children’s performance. In that study, the children were familiarized with each of four hearing-aid setting for at least six weeks before they were evaluated using a range of tests, including the production of 20 sentences. The current study used the recorded sentences as stimuli for intelligibility judgments. Each listener heard sentences produced by two child-talkers, 40 from each talker. The stimuli were presented to listeners at 65 dB SPL via headphones. Four child-talkers received ratings from eight listeners and four from seven listeners. Results: Group-level results indicate that speech intelligibility was rated to be better by inexperienced listeners when children used NLFC than when they did not. Three child-talkers showed a significant advantage with NLFC activation. These results are consistent with the estimated audible bandwidth of hearing aids for individual talkers. Significant positive correlations for intelligibility ratings between inexperienced listeners and clinicians were found, but neither correlated with ratings from parents. Conclusions: The use of NLFC improved intelligibility of speech produced by children, on average, as rated by inexperienced listeners. Clinicians’ judgment of children’s speech production is a clinically viable tool for evaluating the effectiveness of amplification for children. ; 8 page(s)
Keyword:
Children
;
Hearing aids
;
Hearing loss
;
Intelligibility
;
Nonlinear frequency compression
;
Speech production
URL:
http://hdl.handle.net/1959.14/1065121
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