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

Spiousas I, Etchemendy PE, Vergara RO, Calcagno ER, Eguia MC - PLoS ONE (2015)

Bottom Line: This effect seems, at first, paradoxical to naïve listeners since the sonic crystal is an obstacle formed by almost densely packed cylindrical scatterers.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.

View Article: PubMed Central - PubMed

Affiliation: Laboratorio de Acústica y Percepción Sonora, Universidad Nacional de Quilmes, Bernal, Buenos Aires, Argentina.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus

Means of the effect of focusing on the response.Means of the effect of the factor focusing across subjects separated by stimuli set for (a) group A and (b) group B.
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pone.0133271.g005: Means of the effect of focusing on the response.Means of the effect of the factor focusing across subjects separated by stimuli set for (a) group A and (b) group B.

Mentions: A whithin-subjects two-way ANOVA showed that the means for different focusing conditions were statistically different both for group A (F(1, 3) = 61.8, p = 0.004) and group B (F(1, 17) = 81.2, p < 0.001) and there was no statistically significant effect of main factor stimuli set neither for group A (F(4, 12) = 0.62, p = 0.53) nor group B (F(4, 68) = 1.46, p = 0.22). However, there was a statistically significant interaction between stimuli set and focusing for both group A (F(4, 12) = 20.5, p < 0.001) and group B (F(4, 68) = 125, p < 0.001), indicating that the differences on the means between the FOC and non-FOC conditions were dependent on the stimuli set. Means of the effect of focusing across subjects separated by stimuli set are shown in Fig 5 for (a) group A and (b) group B.


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

Spiousas I, Etchemendy PE, Vergara RO, Calcagno ER, Eguia MC - PLoS ONE (2015)

Means of the effect of focusing on the response.Means of the effect of the factor focusing across subjects separated by stimuli set for (a) group A and (b) group B.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4519286&req=5

pone.0133271.g005: Means of the effect of focusing on the response.Means of the effect of the factor focusing across subjects separated by stimuli set for (a) group A and (b) group B.
Mentions: A whithin-subjects two-way ANOVA showed that the means for different focusing conditions were statistically different both for group A (F(1, 3) = 61.8, p = 0.004) and group B (F(1, 17) = 81.2, p < 0.001) and there was no statistically significant effect of main factor stimuli set neither for group A (F(4, 12) = 0.62, p = 0.53) nor group B (F(4, 68) = 1.46, p = 0.22). However, there was a statistically significant interaction between stimuli set and focusing for both group A (F(4, 12) = 20.5, p < 0.001) and group B (F(4, 68) = 125, p < 0.001), indicating that the differences on the means between the FOC and non-FOC conditions were dependent on the stimuli set. Means of the effect of focusing across subjects separated by stimuli set are shown in Fig 5 for (a) group A and (b) group B.

Bottom Line: This effect seems, at first, paradoxical to naïve listeners since the sonic crystal is an obstacle formed by almost densely packed cylindrical scatterers.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.

View Article: PubMed Central - PubMed

Affiliation: Laboratorio de Acústica y Percepción Sonora, Universidad Nacional de Quilmes, Bernal, Buenos Aires, Argentina.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus