Lateralized speech perception in normal-hearing and hearing-impaired listeners and its relationship to temporal processing

Gusztav Locsei, Julie Hefting Pedersen, Søren Laugesen, Sébastien Santurette, Torsten Dau, Ewen MacDonald

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

This study investigated the role of temporal fine structure (TFS) coding in spatially complex, lateralized listening tasks. Speech reception thresholds (SRTs) were measured in young normal-hearing (NH) and two groups of elderly hearing-impaired (HI) listeners in the presence of speech-shaped noise and different interfering talker conditions. The HI subjects had either a mild or moderate hearing loss above 1.5 kHz and reduced audibility was compensated for individually in the speech tests. The target and masker streams were presented as coming from the same or from the opposite side of the head by introducing 0.7-ms interaural time differences (ITD) between the ears. To assess the robustness of TFS coding, frequency discrimination thresholds (FDTs) and interaural phase difference thresholds (IPDTs) were measured at 250 Hz. While SRTs of the NH subjects were clearly better than those of the HI listeners, group differences in binaural benefit due to spatial separation of the maskers from the target remained small. Neither the FDT nor the IPDT tasks showed a clear correlation pattern with the SRTs or with the amount of binaural benefit, respectively. The results suggest that, although HI listeners with normal hearing in the low-frequency range might have elevated SRTs, the binaural benefit they experience due to spatial separation of competing sources can remain similar to that of NH listeners.
Original languageEnglish
Title of host publicationProceedings of ISAAR 2015
EditorsS. Santurette, T. Dau, J. C. Dalsgaard, T. Tranebjærg, T. Andersem
Publication date2016
Pages389-396
ISBN (Print)978-87-990013-5-4
Publication statusPublished - 2016
Event5th International Symposium on Auditory and Audiological Research - Nyborg, Denmark
Duration: 26 Aug 201528 Aug 2015
Conference number: 5
http://www.isaar.eu/

Conference

Conference5th International Symposium on Auditory and Audiological Research
Number5
CountryDenmark
CityNyborg
Period26/08/201528/08/2015
Internet address

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