Comparison of auditory spatial bisection and minimum audible angle in front, lateral, and back space

Aggius-Vella, Elena and Kolarik, Andrew J. and Gori, Monica and Cirstea, Silvia and Campus, Claudio and Moore, Brian C. J. and Pardhan, Shahina (2020) Comparison of auditory spatial bisection and minimum audible angle in front, lateral, and back space. Scientific Reports, 10. p. 6279. ISSN 2045-2322

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Official URL: https://doi.org/10.1038/s41598-020-62983-z

Abstract

Although vision is important for calibrating auditory spatial perception, it only provides information about frontal sound sources. Previous studies of blind and sighted people support the idea that azimuthal spatial bisection in frontal space requires visual calibration, while detection of a change in azimuth (minimum audible angle, MAA) does not. The influence of vision on the ability to map frontal, lateral and back space has not been investigated. Performance in spatial bisection and MAA tasks was assessed for normally sighted blindfolded subjects using bursts of white noise presented frontally, laterally, or from the back relative to the subjects. Thresholds for both tasks were similar in frontal space, lower for the MAA task than for the bisection task in back space, and higher for the MAA task in lateral space. Two interpretations of the results are discussed, one in terms of visual calibration and the use of internal representations of source location and the other based on comparison of the magnitude or direction of change of the available binaural cues. That bisection thresholds were increased in back space relative to front space, where visual calibration information is unavailable, suggests that an internal representation of source location was used for the bisection task.

Item Type: Journal Article
Keywords: Spatial hearing, Visual loss, Sound localization
Faculty: Faculty of Health, Education, Medicine & Social Care
SWORD Depositor: Symplectic User
Depositing User: Symplectic User
Date Deposited: 17 Mar 2020 15:33
Last Modified: 24 Apr 2020 15:45
URI: http://arro.anglia.ac.uk/id/eprint/705313

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