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Open Access On the Role of Interaural Level Differences in Low-Frequency Pure-Tone Lateralization

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This article is Open Access under the terms of the Creative Commons CC BY licence.

While the "Duplex Theory" of sound localization is often interpreted such that low-frequency sounds are localized mainly based on interaural phase differences, and high-frequency sounds based on interaural level differences, some studies have shown an interaction of low-frequency interaural phase and level differences. Using a psychoacoustic lateralization experiment, the present study demonstrates that small interaural level differences are indeed effective in resolving lateralization in the ambiguous range of interaural phase differences at all tested frequencies. These ambiguities occur in free-field conditions at frequencies above about 500 Hz, which is shown by analyzing the magnitude of interaural differences as they occur in typical free-field scenarios. On that basis this study further concludes that naturally occurring interaural level differences on their own are sufficient to correctly attribute sound sources to left or right in many conditions, even at frequencies below 500 Hz.

© 2018 The Author(s). Published by S. Hirzel Verlag · EAA. This is an open access article under the terms of the Creative Commons Attribution (CC BY 4.0) license (https://creativecommons.org/licenses/by/4.0/).
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Document Type: Research Article

Publication date: 01 September 2018

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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