Speech Recognition in Fluctuating and Continuous Maskers: Effects of Hearing Loss and Presentation Level.
Listeners with normal-hearing sensitivity recognize speech more accurately in the presence of fluctuating background sounds, such as a single competing voice, than in unmodulated noise at the same overall level. These performance differences are greatly reduced in listeners with hearing impairment,...
| Published in: | Journal of Speech, Language & Hearing Research Vol. 47; no. 2; pp. 245 - 257 |
|---|---|
| Main Authors: | , |
| Format: | Article |
| Published: |
American Speech-Language-Hearing Association
Apr2004
|
| Subjects: | |
| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=507899794&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 507899794 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 10924388 1SM jtl: Journal of Speech, Language & Hearing Research issn: 10924388 maglogo: N pubinfo: dt: Apr2004 vid: 47 iid: 2 pid: 42 pub: American Speech-Language-Hearing Association artinfo: ui: 507899794 10.1044/1092-4388(2004/020) ppf: 245 ppct: 12 formats: fmt: – @attributes: type: T – @attributes: type: P size: 4.7MB tig: atl: Speech Recognition in Fluctuating and Continuous Maskers: Effects of Hearing Loss and Presentation Level. aug: au: Summers, Van Molis, Michelle R. su: Speech perception Auditory masking Deafness sug: subj: Speech perception Auditory masking Deafness ab: Listeners with normal-hearing sensitivity recognize speech more accurately in the presence of fluctuating background sounds, such as a single competing voice, than in unmodulated noise at the same overall level. These performance differences are greatly reduced in listeners with hearing impairment, who generally receive little benefit from fluctuations in masker envelopes. If this lack of benefit is entirely due to elevated quiet thresholds and the resulting inaudibility of low-amplitude portions of signal + masker, then listeners with hearing impairment should derive increasing benefit from masker fluctuations as presentation levels increase. Listeners with normal-hearing (NH) sensitivity and listeners with hearing impairment (HI) were tested for sentence recognition at moderate and high presentation levels in competing speech-shaped noise, in competing speech by a single talker, and in competing time-reversed speech by the same talker. NH listeners showed more accurate recognition at moderate than at high presentation levels and better performance in fluctuating maskers than in unmodulated noise. For these listeners, modulated versus unmodulated performance differences tended to decrease at high presentation levels. Listeners with HI, as a group, showed performance that was more similar across maskers and presentation levels. Considered individually, only 2 out of 6 listeners with HI showed better overall performance and increasing benefit from masker Fluctuations as presentation level increased. These results suggest that audibility alone does not completely account for the group differences in performance with fluctuating maskers; suprathreshold processing differences between groups also appear to play an important role. Competing speech frequently provided more effective masking than time-reversed speech containing temporal fluctuations of equal magnitude. This finding is consistent with informational" masking resulting from competitive processing of words and phrases within the speech masker that would not occur for time-reversed sentences. Reprinted by permission of the publisher. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
|---|