The perception of apparent auditory source width in hearing-impaired adults

Whitmer, W. M. , Seeber, B. U. and Akeroyd, M. A. (2014) The perception of apparent auditory source width in hearing-impaired adults. Journal of the Acoustical Society of America, 135(6), pp. 3548-3559. (doi: 10.1121/1.4875575)

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Abstract

In a previous study [Whitmer, Seeber and Akeroyd, J. Acoust. Soc. Am. 132, 369–379 (2012)], it was demonstrated that older hearing-impaired (HI) listeners produced visual sketches of headphone-presented noises that were insensitive to changes in interaural coherence. The current study further explores this insensitivity by comparing (a) binaural temporal fine-structure (TFS) resolution and (b) sound localization precision to (c) auditory source width judgments. Thirty-five participants aged 26–81 years with normal to moderately impaired hearing (a) discriminated interaurally phase-shifted tones from diotic tones presented over headphones, (b) located 500-ms speech-spectrum filtered click trains presented over loudspeakers between ±30° in quiet, and (c) sketched the perceived width of low-pass, high-pass, and speech-spectrum noise stimuli presented over loudspeakers from 0° and simultaneously from ±45° at attenuations of 0–20 dB to generate partially coherent stimuli. The results showed a decreasing sensitivity to width with age and impairment which was related to binaural TFS threshold: the worse one's threshold—which was correlated with age—the less the perceived width increased with decreasing interaural coherence. These results suggest that senescent changes to the auditory system do not necessarily lead to perceptions of broader, more diffuse sound images based on interaural coherence.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Whitmer, Dr William and Akeroyd, Dr Michael
Authors: Whitmer, W. M., Seeber, B. U., and Akeroyd, M. A.
College/School:College of Medical Veterinary and Life Sciences > Institute of Health and Wellbeing > Mental Health and Wellbeing
Journal Name:Journal of the Acoustical Society of America
Publisher:Acoustical Society of America
ISSN:0001-4966
ISSN (Online):1520-8524

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