Skip to main content
Top
Published in: Journal of the Association for Research in Otolaryngology 6/2020

Open Access 01-12-2020 | Research Article

Perceptual Weighting of Binaural Lateralization Cues across Frequency Bands

Authors: Axel Ahrens, Suyash Narendra Joshi, Bastian Epp

Published in: Journal of the Association for Research in Otolaryngology | Issue 6/2020

Login to get access

Abstract

The auditory system uses interaural time and level differences (ITD and ILD) as cues to localize and lateralize sounds. The availability of ITDs and ILDs in the auditory system is limited by neural phase-locking and by the head size, respectively. Although the frequency-specific limitations are well known, the relative contribution of ITDs and ILDs in individual frequency bands in broadband stimuli is unknown. To determine these relative contributions, or spectral weights, listeners were asked to lateralize stimuli consisting of eleven simultaneously presented 1-ERB-wide noise bands centered between 442 and 5544 Hz and separated by 1-ERB-wide gaps. Either ITDs or ILDs were varied independently across each noise band, while fixing the other interaural disparity to either 0 dB or 0 μs. The weights were obtained using a multiple linear regression analysis. In a second experiment, the effect of auditory enhancement on the spectral weights was investigated. The enhancement of single noise bands was realized by presenting ten of the noise bands as preceding and following sounds (pre- and post-cursors, respectively). Listeners were asked to lateralize the stimuli as in the first experiment. Results show that in the absence of pre- and post-cursors, only the lowest or highest frequency band received highest weight for ITD and ILD, respectively. Auditory enhancement led to significantly enhanced weights given to the band without the pre- and post-cursor. The weight enhancement could only be observed at low frequencies, when determined with ITD cues and for low and high frequencies for ILDs. Hence, the auditory system seems to be able to change the spectral weighting of binaural information depending on the information content.
Literature
go back to reference Blauert J (1984) Spatial hearing: the psychophysics of human sound localization. MIT Press Blauert J (1984) Spatial hearing: the psychophysics of human sound localization. MIT Press
go back to reference Bronkhorst AW (2000) The cocktail party phenomenon: a review of research on speech intelligibility in multiple-talker conditions. Acta Acustica United Acustica 86(1):117–128 Bronkhorst AW (2000) The cocktail party phenomenon: a review of research on speech intelligibility in multiple-talker conditions. Acta Acustica United Acustica 86(1):117–128
go back to reference Raatgever J (1980) On the binaural processing of stimuli with different interaural phase relations. PhD thesis, Delft University Raatgever J (1980) On the binaural processing of stimuli with different interaural phase relations. PhD thesis, Delft University
Metadata
Title
Perceptual Weighting of Binaural Lateralization Cues across Frequency Bands
Authors
Axel Ahrens
Suyash Narendra Joshi
Bastian Epp
Publication date
01-12-2020
Publisher
Springer US
Published in
Journal of the Association for Research in Otolaryngology / Issue 6/2020
Print ISSN: 1525-3961
Electronic ISSN: 1438-7573
DOI
https://doi.org/10.1007/s10162-020-00770-3

Other articles of this Issue 6/2020

Journal of the Association for Research in Otolaryngology 6/2020 Go to the issue