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Cognitive Hearing Aids? - Insights and Possibilities
Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology. Linköping University, The Swedish Institute for Disability Research. Eriksholm Research Centre, Snekkersten, Denmark .
Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology. Linköping University, The Swedish Institute for Disability Research. Eriksholm Research Centre, Snekkersten, Denmark .
2015 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The working memory plays an important role in successfully overcoming adverse listening conditions and should consequently be considered when designing and testing hearing aids. A number of studies have established the relationship between hearing in noise and working memory involvement, but with the Sentence-final Word Identification and Recall (SWIRL) test, it is possible to show that working memory is also involved in listening under favorable conditions and that noise reduction has a positive influence in situation with very little noise. Although the capacity of the working memory is a finite individual size, its involvement can differ with fatigue and other factors and individualization of hearing aids should take this into account to obtain the best performance. A way of individually adapting hearing aids is based on changes in the electrical activity of the brain (EEG). Here we present the possibilities that arise from using EEG and show that ear-mounted electrodes is able to record useful EEG that can be explored for individualization of hearing aids. Such an adaptation could be done based on changes in the electrical activity of the brain (EEG). Here we present the possibilities that arise from using EEG and show that ear-mounted electrodes is able to record useful EEG that can be explored for individualization of hearing aids.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015. Vol. 1703, 090001- p.
Series
AIP Conference Proceedings, ISSN 0094-243X
National Category
Otorhinolaryngology
Identifiers
URN: urn:nbn:se:liu:diva-126560DOI: 10.1063/1.4939399ISI: 000372065400086ISBN: 978-0-7354-1350-4 (print)OAI: oai:DiVA.org:liu-126560DiVA: diva2:915460
Conference
12th international workshop in Mechanics of Hearing, Cape Sounio, Greece, 23-29 May 2014
Available from: 2016-03-30 Created: 2016-03-30 Last updated: 2017-02-07
In thesis
1. Neural and Cognitive Effects of Hearing Loss on Speech Processing
Open this publication in new window or tab >>Neural and Cognitive Effects of Hearing Loss on Speech Processing
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Neurala och kognitiva effekter av hörselnedsättning vid bearbetning av talsignaler
Abstract [en]

Understanding speech in the presence of noise can be difficult, especially when suffering from a hearing loss. This thesis examined behavioural and electrophysiological measures of speech processing with the aim of establishing how they were influenced by hearing loss (internal degradation) and listening condition (external degradation). The hypothesis that more internal and external degradation of a speech signal would result in higher working memory (WM) involvement was investigated in four studies. The behavioural measure of speech recognition consistently decreased with worse hearing, whereas lower WM capacity only resulted in poorer speech recognition when sound were spatially co-located. Electrophysiological data (EEG) recorded during speech processing, revealed that worse hearing was associated with an increase in inhibitory alpha activity (~10 Hz). This indicates that listeners with worse hearing experienced a higher degree of WM involvement during the listening task. When increasing the level of background noise, listeners with poorer hearing exhibited a breakdown in alpha activity, suggesting that these listeners reached a ceiling at which no more WM resources could be released through neural inhibition. Worse hearing was also associated with a reduced ability to selectively attend to one of two simultaneous talkers, brought on by a reduced neural inhibition of the to-be-ignored speech. Increasing the level of background noise reduced the ability to neurally track the to-be-attended speech. That internal and external degradation affected the tracking of ignored and attended speech, respectively, indicates that the two speech streams were neurally processed as independent objects. This thesis demonstrates for the first time that hearing loss causes changes in the induced neural activity during speech processing. In the last paper of the thesis, it is tentatively suggested that neural activity can be utilized from electrodes positioned in the ear canal (EarEEG) for adapting hearing-aid processing to suite the individual listeners and situation.

Abstract [sv]

Att förstå tal i brus kan vara svårt, speciellt när man lider av en hörselnedsättning. Denna avhandling undersöker beteende- och elektrofysiologiska data med föremålet att bestämma hur de påverkas av hörselskada (intern försämring) och lyssningssituation (extern försämring). Hypotesen att båda intern och extern försämring av talsignalen resulterar i mer aktivering av arbetsminnet under bearbetning av talsignaler har undersökts i fyra studier. Beteendedata visade att talförståelse försämrades med större hörselnedsättning, medan lägre arbetsminneskapacitet endast resulterade i sämre talförståelse när ljudkällorna inte var rumsligt sammanfallande. Elektrofysiologiska mätningar (EEG) gjorda under bearbetning av tal, visade at sämre hörsel associerades med högre inhibitorisk alfa-aktivitet (~10 Hz). Detta indikerar att personer med sämre hörsel upplevde en högre involvering av arbetsminnet under lyssningsuppgiften. Då nivån av bakgrundsljud höjdes, visade personer med sämre hörsel ett sammanbrott av alfaaktiviteten, vilket tyder på att de nådde ett tak där ytterligare arbetsminnes-resurser inte kunde frigöras genom neural inhibition. Sämre hörsel var också förknippat med en reducerad förmåga till at fokusera uppmärksamheten på en av två samtidiga talare, förorsakat av en reducerad förmåga till neuralt att undertrycka den störande talsignalen. En ökning av nivån av bakgrundsljud minskade förmågan att inkoda den relevante talsignalen. Att intern och extern försämring påverkade respektive inkodning av störande och relevant tal, indikerar att de två tal-strömma är neuralt behandlas som oavhängiga objekt. Denna avhandling demonstrerar för första gången att hörselskada förorsakar ändringar i den inducerade neurale aktiviteten under bearbetningen av talsignaler. I avhandlingens sista artikel förslås det preliminärt att neural aktivitet kan upptas från elektroder placerade i hörselgången som kan användas till att kontrollera hörapparat signalbehandling.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2017. 70 p.
Series
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1552Studies from the Swedish Institute for Disability Research, ISSN 1650-1128 ; 81
Keyword
Hearing loss, speech processing, electroencephalogram/EEG, working memory, cognitive load, hearing aid, Hörselnedsättning, bearbetning av tal, elektroencefalogram/EEG, arbetsminne, kognitiv belastning, hörapparat
National Category
Otorhinolaryngology Public Health, Global Health, Social Medicine and Epidemiology Neurosciences Health Sciences
Identifiers
urn:nbn:se:liu:diva-134255 (URN)10.3384/diss-diva-134255 (DOI)9789176856406 (ISBN)
Public defence
2017-03-16, Elsa Brändström-salen, Campus US, Norra entrén, ingång 7, plan 9, Linköping, 13:00 (English)
Opponent
Supervisors
Note

Funded by the Oticon Foundation. Project number: 11-2757.

Available from: 2017-02-20 Created: 2017-01-31 Last updated: 2017-02-21Bibliographically approved

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