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An Auditory Illusion of Proximity of the Source Induced by Sonic Crystals

In this work we report an illusion of proximity of a sound source created by a sonic crystal placed between the source and a listener. This effect seems, at first, paradoxical to naïve listeners since the sonic crystal is an obstacle formed by almost densely packed cylindrical scatterers. Even when...

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Autores principales: Spiousas, Ignacio, Etchemendy, Pablo E., Vergara, Ramiro O., Calcagno, Esteban R., Eguia, Manuel C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4519286/
https://www.ncbi.nlm.nih.gov/pubmed/26222281
http://dx.doi.org/10.1371/journal.pone.0133271
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author Spiousas, Ignacio
Etchemendy, Pablo E.
Vergara, Ramiro O.
Calcagno, Esteban R.
Eguia, Manuel C.
author_facet Spiousas, Ignacio
Etchemendy, Pablo E.
Vergara, Ramiro O.
Calcagno, Esteban R.
Eguia, Manuel C.
author_sort Spiousas, Ignacio
collection PubMed
description In this work we report an illusion of proximity of a sound source created by a sonic crystal placed between the source and a listener. This effect seems, at first, paradoxical to naïve listeners since the sonic crystal is an obstacle formed by almost densely packed cylindrical scatterers. Even when the singular acoustical properties of these periodic composite materials have been studied extensively (including band gaps, deaf bands, negative refraction, and birrefringence), the possible perceptual effects remain unexplored. The illusion reported here is studied through acoustical measurements and a psychophysical experiment. The results of the acoustical measurements showed that, for a certain frequency range and region in space where the focusing phenomenon takes place, the sonic crystal induces substantial increases in binaural intensity, direct-to-reverberant energy ratio and interaural cross-correlation values, all cues involved in the auditory perception of distance. Consistently, the results of the psychophysical experiment revealed that the presence of the sonic crystal between the sound source and the listener produces a significant reduction of the perceived relative distance to the sound source.
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spelling pubmed-45192862015-07-31 An Auditory Illusion of Proximity of the Source Induced by Sonic Crystals Spiousas, Ignacio Etchemendy, Pablo E. Vergara, Ramiro O. Calcagno, Esteban R. Eguia, Manuel C. PLoS One Research Article In this work we report an illusion of proximity of a sound source created by a sonic crystal placed between the source and a listener. This effect seems, at first, paradoxical to naïve listeners since the sonic crystal is an obstacle formed by almost densely packed cylindrical scatterers. Even when the singular acoustical properties of these periodic composite materials have been studied extensively (including band gaps, deaf bands, negative refraction, and birrefringence), the possible perceptual effects remain unexplored. The illusion reported here is studied through acoustical measurements and a psychophysical experiment. The results of the acoustical measurements showed that, for a certain frequency range and region in space where the focusing phenomenon takes place, the sonic crystal induces substantial increases in binaural intensity, direct-to-reverberant energy ratio and interaural cross-correlation values, all cues involved in the auditory perception of distance. Consistently, the results of the psychophysical experiment revealed that the presence of the sonic crystal between the sound source and the listener produces a significant reduction of the perceived relative distance to the sound source. Public Library of Science 2015-07-29 /pmc/articles/PMC4519286/ /pubmed/26222281 http://dx.doi.org/10.1371/journal.pone.0133271 Text en © 2015 Spiousas et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Spiousas, Ignacio
Etchemendy, Pablo E.
Vergara, Ramiro O.
Calcagno, Esteban R.
Eguia, Manuel C.
An Auditory Illusion of Proximity of the Source Induced by Sonic Crystals
title An Auditory Illusion of Proximity of the Source Induced by Sonic Crystals
title_full An Auditory Illusion of Proximity of the Source Induced by Sonic Crystals
title_fullStr An Auditory Illusion of Proximity of the Source Induced by Sonic Crystals
title_full_unstemmed An Auditory Illusion of Proximity of the Source Induced by Sonic Crystals
title_short An Auditory Illusion of Proximity of the Source Induced by Sonic Crystals
title_sort auditory illusion of proximity of the source induced by sonic crystals
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4519286/
https://www.ncbi.nlm.nih.gov/pubmed/26222281
http://dx.doi.org/10.1371/journal.pone.0133271
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