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Cognitive performance and perceived effort in speech processing tasks: effects of different noise backgrounds in normals and in hearing-impaired subjects
Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology . Linköping University, Faculty of Health Sciences.
Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology . Linköping University, Faculty of Health Sciences.
Linköping University, Department of Behavioural Sciences and Learning. Linköping University, Faculty of Arts and Sciences.
Linköping University, Department of Clinical and Experimental Medicine, Technical Audiology . Linköping University, Faculty of Health Sciences.
2005 (English)In: International Journal of Audiology, ISSN 1499-2027, Vol. 44, no 3, 131-143 p.Article in journal (Refereed) Published
Abstract [en]

Cognitive tests of speech understanding were administered (presented as text, or in auditory or audiovisual modality) and perceived effort was rated. This was done in four background conditions: in silence, and in three types of noise (S/N=+10 dB) varying in temporal structure and meaningfulness. Four groups of 12 subjects each (young/elderly with normal hearing and young/elderly with hearing impairment) participated. The presence of noise had a negative effect on accuracy and speed of performance in the speech processing tasks, and resulted in higher scores of perceived effort, even when the stimuli were presented as text. Differences in performance between noise conditions existed. In the subjective scores, the noise with temporal variations, but without meaningful content, was the most disruptive of the three noise conditions. In the objective scores, the hearing-impaired subjects showed poorer results in noise with temporal variations. The elderly subjects were more distracted by noise with temporal variations, and 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.

Place, publisher, year, edition, pages
2005. Vol. 44, no 3, 131-143 p.
Keyword [en]
Speech processing; Cognitive tests; Perceived effort; Hearing; Age; Noise; Audio-visual contribution
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-13586DOI: 10.1080/14992020500057244OAI: oai:DiVA.org:liu-13586DiVA: diva2:20991
Available from: 2005-05-28 Created: 2005-05-28
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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Larsby, Birgitta Hällgren, MathiasLyxell, BjörnArlinger, Stig

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