Skip to Main content Skip to Navigation
New interface
Journal articles

Effects of interaural differences on the loudness of low-frequency pure tones

Vincent Koehl 1 Mathieu Paquier 1 Etienne Hendrickx 1 
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
Abstract : The loudness related to a sound may vary according to the localization of its source. This phenomenon is described as directional loudness and has been mainly observed for high-frequency sounds and for sources located in the horizontal plane. Because of the acoustic shadow of the head, the left and right ear pressures are modified depending on the source azimuth and the global loudness resulting from a summation process may vary accordingly. But directional loudness has also been reported to occur at 400 Hz, where shadowing effects are usually rather small. It might therefore be suspected that directional loudness effects could be influenced by other parameters involved in the localization process. In a previous study, a small but significant increase of loudness with increasing interaural time difference (ITD) was shown for low-frequency pure tones (200 and 400 Hz) at a low loudness level (40 phon). The present study aimed at getting insight into the potential cause and extent of this effect by assessing the loudness of similar pure tones lateralized with headphones by applying an interaural level difference (ILD) in addition to an ITD and by measuring the effect of ITD at the hearing threshold. It showed significant effects of both ILD and ITD on loudness, and no interaction between these factors. As the effects added even when the factors were contradictory, it supports the hypothesis that the effect is caused by the ITD itself and is not related to the localization process. However, the ITD effect was not significant at the hearing threshold.
Complete list of metadata

Cited literature [27 references]  Display  Hide  Download
Contributor : Vincent Koehl Connect in order to contact the contributor
Submitted on : Thursday, November 10, 2016 - 12:05:34 PM
Last modification on : Monday, March 14, 2022 - 11:08:10 AM
Long-term archiving on: : Tuesday, March 14, 2017 - 11:26:04 PM


Files produced by the author(s)



Vincent Koehl, Mathieu Paquier, Etienne Hendrickx. Effects of interaural differences on the loudness of low-frequency pure tones. Acta Acustica united with Acustica, 2015, 101 (6), pp.1168-1173. ⟨10.3813/AAA.918909⟩. ⟨hal-01225306⟩



Record views


Files downloads