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Speech understanding in quiet and noise, with and without hearing aids
Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Oto-Rhiono-Laryngology and Head & Neck Surgery. Östergötlands Läns Landsting, Reconstruction Centre, Department of ENT - Head and Neck Surgery UHL.
Linköping University, Department of Behavioural Sciences. Linköping University, Faculty of Arts and Sciences.
Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Technical Audiology.
2005 (English)In: International Journal of Audiology, ISSN 1499-2027, E-ISSN 1708-8186, Vol. 44, no 10, 574-583 p.Article in journal (Refereed) Published
Abstract [en]

Speech recognition and cognitive functions important for speech understanding were evaluated by objective measures and by scores of perceived effort, with and without hearing aids. The tests were performed in silence, and with background conditions of speech spectrum random noise and ordinary speech. One young and one elderly group of twelve hearing-impaired subjects each participated. Hearing aid use improved speech recognition in silence (7 dB) and in the condition with speech as background (2.5 dB S/N), but did not change the perceived effort scores. In the cognitive tests no hearing aid benefit was seen in objective measures, while there was an effect of hearing aid use in scores of perceived effort, subjects reported less effort. There were no age effects on hearing aid benefit. In conclusion, hearing aid use may result in reduced effort in listening tasks that is not associated with improvement in objective scores. © 2005 British Society of Audiology, International Society of Audiology, and Nordic Audiological Society.

Place, publisher, year, edition, pages
2005. Vol. 44, no 10, 574-583 p.
National Category
Social Sciences
Identifiers
URN: urn:nbn:se:liu:diva-29202DOI: 10.1080/14992020500190011Local ID: 14477OAI: oai:DiVA.org:liu-29202DiVA: diva2:250013
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2017-12-13
In thesis
1. Hearing and cognition in speech comprehension. Methods and applications
Open this publication in new window or tab >>Hearing and cognition in speech comprehension. Methods and applications
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Central auditory processing is complex and can not be evaluated by a single method. This thesis focuses on assessment of some aspects of central auditory functions by the use of dichotic speech tests and cognitive tests that tax functions important for speech processing.

Paper A deals with the cognitive effects in dichotic speech testing in elderly hearing-impaired subjects. It was found that different listening tasks in the dichotic tests put different demands on cognitive ability, shown by a varying degree of correlation between cognitive functions and dichotic test parameters. Age-related cognitive decline was strongly connected with problems to perceive stimuli presented to the left ear.

Paper B presents a new cognitive test battery sensitive for functions important for speech processing and understanding, performed in text, auditory and audiovisual modalities. The test battery was evaluated in four groups, differing in age and hearing status, and has proven to be useful in assessing the relative contribution of different input-modalities and the effect of age, hearingimpairment and visual contribution on functions important for speech processing.

In Paper C the test battery developed in Paper B was used to study listening situations with different kinds of background noise. Interfering noise at +10 dB signal-to-noise ratio has significant negative effects on performance in speech processing tasks and on the effort perceived. Hearing-impaired subjects showed poorer results in noise with temporal variations, and elderly subjects were more distracted by noise with temporal variations, especially by noise with meaningful content. In noise, all subjects, particularly those with impaired hearing, were more dependent upon visual cues than in the quiet condition.

Hearing aid benefit in speech processing with and without background noise was studied in Paper D. The test battery developed in Paper B was used together with a standard measure of speech recognition. With hearing aids, speech recognition was improved in the background condition without noise and in the background condition of ordinary speech. Significantly less effort was perceived in the cognitive tests when hearing aids were used, although only minor benefits of hearing aid amplification were seen. This underlines the importance of considering perceived effort as a dimension when evaluating hearing aid benefit, in further research as well as in clinical practice.

The results from the studies contribute to the knowledge about speech processing but also to the search for more specific evaluation of speech understanding, incorporating both sensory and cognitive factors.

Place, publisher, year, edition, pages
Linköping: Institutionen för nervsystem och rörelseorgan, 2005. 37 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 927Linköping University Medical Dissertations, ISSN 0345-0082 ; 888Studies from the Swedish Institute for Disability Research, ISSN 1650-1128 ; 14
Keyword
Aging, physiology, cognition, cognition disorders, dichotic listening tests, hearing loss, sensorineural, neuropsychological tests, speech perception
National Category
Otorhinolaryngology
Identifiers
urn:nbn:se:liu:diva-5039 (URN)91-85297-93-3 (ISBN)
Public defence
2005-04-22, Elsa Brändströms föreläsningssal, Hälsouniversitetet, Campus US, Linköpings universitet, Linköping, 13:00 (English)
Opponent
Supervisors
Note
The ISBN 91-85297-49-6 in the printed verison is incorrect. The correct ISBN is 91-85297-93-3.Available from: 2005-05-28 Created: 2005-05-28 Last updated: 2010-01-13Bibliographically approved

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Hällgren, MathiasLarsby, BirgittaLyxell, BjörnArlinger, Stig

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