Simultaneous reflection masking: dependency on direct sound level and hearing-impairment

Jörg Buchholz, Paul Glad Mihai

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

Abstract

Simultaneous reflection masked thresholds (RMTs) were measured for 3 normal-hearing (NH) and 3 hearing-impaired (HI) subjects as a function of reflection delay. All stimuli were presented diotically and dichotically, using a 200 ms long broadband noise (100-50000 Hz) as input signal. For 55 dB-SL direct sound level, NH-listeners showed a binaural suppression effect for delays smaller than 7-10 ms and a binaural enhancement effect for larger delays. When decreasing the direct sound level to 15 dB-SL, the only significant change observed was that the dichotic RMT increased for delays larger than about 7 ms. In consequence, the binaural enhancement effect was strongly reduced, but the binaural suppression effect was unchanged. HI-listeners (at 30 dB-SL) showed a strong binaural suppression effect for delays smaller than about 3ms and only a very small binaural enhancement effect for larger delays. Hence, in contrast to binaural reflection enhancement, binaural reflection suppression seems to involve mechanisms that are robust to auditory-internal noise-floor and hearing-impairment. Moreover, differences between the RMTs for HI- and NH-listeners were in prin-ciple agreement with differences expected from changed auditory filter bandwidth and audi-bility. However, the stimulus level-dependency of the auditory filters’ bandwidth was not reflected in the SRMT data.
Original languageEnglish
Title of host publicationInternational Symposium on Auditory and Audiological Research
Place of PublicationHelsingør
Publication date2008
ISBN (Print)87-990013-1-4
Publication statusPublished - 2008
Event1st International Symposium on Auditory and Audiological Research: Auditory Signal Processing in Hearing-Impaired Listeners - Elsinore, Denmark
Duration: 29 Aug 200731 Aug 2007

Conference

Conference1st International Symposium on Auditory and Audiological Research
Country/TerritoryDenmark
CityElsinore
Period29/08/200731/08/2007

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