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International Journal of Otolaryngology
Volume 2012 (2012), Article ID 865731, 11 pages
http://dx.doi.org/10.1155/2012/865731
Research Article

Processing Load Induced by Informational Masking Is Related to Linguistic Abilities

1Department of ENT/Audiology and EMGO Institute for Health and Care Research, VU University Medical Center, Boelelaan 1117, 1081 HV Amsterdam, The Netherlands
2Linnaeus Centre HEAD, Swedish Institute for Disability Research, Linköping University, 581 83 Linköping, Sweden
3Department of Behavioral Sciences and Learning, Linköping University, 581 83 Linköping, Sweden

Received 21 June 2012; Revised 31 August 2012; Accepted 4 September 2012

Academic Editor: Harvey B. Abrams

Copyright © 2012 Thomas Koelewijn et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

It is often assumed that the benefit of hearing aids is not primarily reflected in better speech performance, but that it is reflected in less effortful listening in the aided than in the unaided condition. Before being able to assess such a hearing aid benefit the present study examined how processing load while listening to masked speech relates to inter-individual differences in cognitive abilities relevant for language processing. Pupil dilation was measured in thirty-two normal hearing participants while listening to sentences masked by fluctuating noise or interfering speech at either 50% and 84% intelligibility. Additionally, working memory capacity, inhibition of irrelevant information, and written text reception was tested. Pupil responses were larger during interfering speech as compared to fluctuating noise. This effect was independent of intelligibility level. Regression analysis revealed that high working memory capacity, better inhibition, and better text reception were related to better speech reception thresholds. Apart from a positive relation to speech recognition, better inhibition and better text reception are also positively related to larger pupil dilation in the single-talker masker conditions. We conclude that better cognitive abilities not only relate to better speech perception, but also partly explain higher processing load in complex listening conditions.