Neural Representation Enhanced for Speech and Reduced for Background Noise With a Hearing Aid Noise Reduction Scheme During a Selective Attention Task

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Alickovic, EminaLinköpings universitet,Reglerteknik,Tekniska fakulteten,Oticon AS, Denmark (author)

Neural Representation Enhanced for Speech and Reduced for Background Noise With a Hearing Aid Noise Reduction Scheme During a Selective Attention Task

Article/chapterEnglish2020

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2020-09-10
FRONTIERS MEDIA SA,2020
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LIBRIS-ID:oai:DiVA.org:liu-171001
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-171001URI
https://doi.org/10.3389/fnins.2020.00846DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

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Objectives Selectively attending to a target talker while ignoring multiple interferers (competing talkers and background noise) is more difficult for hearing-impaired (HI) individuals compared to normal-hearing (NH) listeners. Such tasks also become more difficult as background noise levels increase. To overcome these difficulties, hearing aids (HAs) offer noise reduction (NR) schemes. The objective of this study was to investigate the effect of NR processing (inactive, where the NR feature was switched off,vs.active, where the NR feature was switched on) on the neural representation of speech envelopes across two different background noise levels [+3 dB signal-to-noise ratio (SNR) and +8 dB SNR] by using a stimulus reconstruction (SR) method. Design To explore how NR processing supports the listeners selective auditory attention, we recruited 22 HI participants fitted with HAs. To investigate the interplay between NR schemes, background noise, and neural representation of the speech envelopes, we used electroencephalography (EEG). The participants were instructed to listen to a target talker in front while ignoring a competing talker in front in the presence of multi-talker background babble noise. Results The results show that the neural representation of the attended speech envelope was enhanced by the active NR scheme for both background noise levels. The neural representation of the attended speech envelope at lower (+3 dB) SNR was shifted, approximately by 5 dB, toward the higher (+8 dB) SNR when the NR scheme was turned on. The neural representation of the ignored speech envelope was modulated by the NR scheme and was mostly enhanced in the conditions with more background noise. The neural representation of the background noise was modulated (i.e., reduced) by the NR scheme and was significantly reduced in the conditions with more background noise. The neural representation of the net sum of the ignored acoustic scene (ignored talker and background babble) was not modulated by the NR scheme but was significantly reduced in the conditions with a reduced level of background noise. Taken together, we showed that the active NR scheme enhanced the neural representation of both the attended and the ignored speakers and reduced the neural representation of background noise, while the net sum of the ignored acoustic scene was not enhanced. Conclusion Altogether our results support the hypothesis that the NR schemes in HAs serve to enhance the neural representation of speech and reduce the neural representation of background noise during a selective attention task. We contend that these results provide a neural index that could be useful for assessing the effects of HAs on auditory and cognitive processing in HI populations.

Subject headings and genre

SAMHÄLLSVETENSKAP Psykologi Psykologi hsv//swe
SOCIAL SCIENCES Psychology Psychology hsv//eng
hearing impairment; hearing aids; noise reduction scheme; electroencephalography; stimulus reconstruction

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Lunner, ThomasLinköpings universitet,Reglerteknik,Tekniska fakulteten,Institutet för handikappvetenskap (IHV),Tech Univ Denmark, Denmark(Swepub:liu)tholu94 (author)
Wendt, DorotheaTech Univ Denmark, Denmark (author)
Fiedler, LorenzOticon AS, Denmark (author)
Hietkamp, RenskjeOticon AS, Denmark (author)
Ng, Hoi Ning ElaineLinköpings universitet,Handikappvetenskap,Filosofiska fakulteten,Institutet för handikappvetenskap (IHV),Oticon AS, Denmark(Swepub:liu)hoini65 (author)
Graversen, CarinaOticon AS, Denmark (author)
Linköpings universitetReglerteknik (creator_code:org_t)

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In:Frontiers in Neuroscience: FRONTIERS MEDIA SA141662-45481662-453X

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By the author/editor: Alickovic, Emina; Lunner, Thomas; Wendt, Dorothea; Fiedler, Lorenz; Hietkamp, Renskj ...; Ng, Hoi Ning Ela ...; show more...; Graversen, Carin ...; show less...

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SOCIAL SCIENCES: SOCIAL SCIENCES; and Psychology; and Psychology

Articles in the publication: Frontiers in Neu ...

By the university: Linköping University

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