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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

Effect of focusing on the response.Individual mean and standard errors of the effect of focusing on the response, separated by factors focusing and stimuli set for (a) group A and (b) group B. Responses under (non-) FOC refers to stimuli (not) belonging to the focusing region defined in Eq 1. The central dashed line indicates the chance level of the response.
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pone.0133271.g004: Effect of focusing on the response.Individual mean and standard errors of the effect of focusing on the response, separated by factors focusing and stimuli set for (a) group A and (b) group B. Responses under (non-) FOC refers to stimuli (not) belonging to the focusing region defined in Eq 1. The central dashed line indicates the chance level of the response.

Mentions: In order to verify the relation between the focusing region and the positive shift, we computed the individual mean response for each stimuli set, subject and focusing condition, collapsing position and frequency factors into the new factor focusing according to the region defined in Eq 1. In this way, we can compare the responses for stimuli belonging (FOC) or not belonging (non-FOC) to the focusing region. The individual responses with their standard errors separated by factors focusing and stimuli set are shown in Fig 4 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)

Effect of focusing on the response.Individual mean and standard errors of the effect of focusing on the response, separated by factors focusing and stimuli set for (a) group A and (b) group B. Responses under (non-) FOC refers to stimuli (not) belonging to the focusing region defined in Eq 1. The central dashed line indicates the chance level of the response.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0133271.g004: Effect of focusing on the response.Individual mean and standard errors of the effect of focusing on the response, separated by factors focusing and stimuli set for (a) group A and (b) group B. Responses under (non-) FOC refers to stimuli (not) belonging to the focusing region defined in Eq 1. The central dashed line indicates the chance level of the response.
Mentions: In order to verify the relation between the focusing region and the positive shift, we computed the individual mean response for each stimuli set, subject and focusing condition, collapsing position and frequency factors into the new factor focusing according to the region defined in Eq 1. In this way, we can compare the responses for stimuli belonging (FOC) or not belonging (non-FOC) to the focusing region. The individual responses with their standard errors separated by factors focusing and stimuli set are shown in Fig 4 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