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Binaural loudness constancy

Culling, John F. ORCID: and Dare, Helen 2016. Binaural loudness constancy. Presented at: 17th International Symposium on Hearing (ISH), Groningen, The Netherlands, 15-19 June 2015. Published in: van Dijk, P., Başkent, D., Gaudrain, E., de Kleine, E., Wagner, A. and Lanting, C. eds. Physiology, Psychoacoustics and Cognition in Normal and Impaired Hearing. Advances in Experimental Medicine and Biology (894) Heidelberg: Springer, pp. 65-72. 10.1007/978-3-319-25474-6_8

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In binaural loudness summation, diotic presentation of a sound usually produces greater loudness than monaural presentation. However, experiments using loudspeaker presentation with and without earplugs find that magnitude estimates of loudness are little altered by the earplug, suggesting a form of loudness constancy. We explored the significance of controlling stimulation of the second ear using meatal occlusion as opposed to the deactivation of one earphone. We measured the point of subjective loudness equality (PSLE) for monaural vs. binaural presentation using an adaptive technique for both speech and noise. These stimuli were presented in a reverberant room over a loudspeaker to the right of the listener, or over lightweight headphones. Using the headphones, stimuli were either presented dry, or matched to those of the loudspeaker by convolution with impulse responses measured from the loudspeaker to the listener position, using an acoustic manikin. The headphone response was also compensated. Using the loudspeaker, monaural presentation was achieved by instructing the listener to block the left ear with a finger. Near perfect binaural loudness constancy was observed using loudspeaker presentation, while there was a summation effect of 3–6 dB for both headphone conditions. However, only partial constancy was observed when meatal occlusion was simulated. These results suggest that there may be contributions to binaural loudness constancy from residual low frequencies at the occluded ear as well as a cognitive element, which is activated by the knowledge that one ear is occluded.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Psychology
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Uncontrolled Keywords: Loudness summation; Perceptual constancy; Meatal occlusion; Monaural; Virtual acoustics
Publisher: Springer
ISBN: 9783319254722
ISSN: 0065-2598
Date of First Compliant Deposit: 21 July 2017
Last Modified: 02 Nov 2022 11:41

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