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Temporal adaptation to audiovisual asynchrony generalizes across different sound frequencies.

Navarra J, García-Morera J, Spence C - Front Psychol (2012)

Bottom Line: The human brain exhibits a highly adaptive ability to reduce natural asynchronies between visual and auditory signals.In the present study, we investigated whether or not temporal adaptation generalizes across different auditory frequencies.This suggests that temporal recalibration influences the audiovisual perception of sounds in a frequency non-specific manner and may imply the participation of non-primary perceptual areas of the brain that are not constrained by certain physical features such as sound frequency.

View Article: PubMed Central - PubMed

Affiliation: Fundació Sant Joan de Déu, Parc Sanitari Sant Joan de Déu - Hospital Sant Joan de Déu Esplugues de Llobregat, Barcelona, Spain.

ABSTRACT
The human brain exhibits a highly adaptive ability to reduce natural asynchronies between visual and auditory signals. Even though this mechanism robustly modulates the subsequent perception of sounds and visual stimuli, it is still unclear how such a temporal realignment is attained. In the present study, we investigated whether or not temporal adaptation generalizes across different auditory frequencies. In a first exposure phase, participants adapted to a fixed 220-ms audiovisual asynchrony or else to synchrony for 3 min. In a second phase, the participants performed simultaneity judgments (SJs) regarding pairs of audiovisual stimuli that were presented at different stimulus onset asynchronies (SOAs) and included either the same tone as in the exposure phase (a 250 Hz beep), another low-pitched beep (300 Hz), or a high-pitched beep (2500 Hz). Temporal realignment was always observed (when comparing SJ performance after exposure to asynchrony vs. synchrony), regardless of the frequency of the sound tested. This suggests that temporal recalibration influences the audiovisual perception of sounds in a frequency non-specific manner and may imply the participation of non-primary perceptual areas of the brain that are not constrained by certain physical features such as sound frequency.

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Related in: MedlinePlus

Participants were exposed, for approximately 3 min, to audiovisual synchrony (in one block) or asynchrony [in another block; see (A,B), respectively]. The possible effects of adaptation to asynchrony were obtained in a posterior test phase in which the participants performed simultaneity judgments (SJs) regarding audiovisual stimulus pairs including the same tone as the one presented during the exposure phase (250 Hz) or else another tone (300 or 2500 Hz). Eight re-exposure audiovisual stimulus pairs (including 250 Hz tones) were presented every three SJ trials [see (C)].
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Figure 1: Participants were exposed, for approximately 3 min, to audiovisual synchrony (in one block) or asynchrony [in another block; see (A,B), respectively]. The possible effects of adaptation to asynchrony were obtained in a posterior test phase in which the participants performed simultaneity judgments (SJs) regarding audiovisual stimulus pairs including the same tone as the one presented during the exposure phase (250 Hz) or else another tone (300 or 2500 Hz). Eight re-exposure audiovisual stimulus pairs (including 250 Hz tones) were presented every three SJ trials [see (C)].

Mentions: The study was conducted in two sessions (each lasting about 45 min); one designed to test for generalization effects from 250 to 2500 Hz (that is, from one frequency range to another) and the other to test for generalization effects from 250 to 300 Hz (both falling in the same frequency range). Each session contained two different blocks, both starting with a 3-min exposure phase where pairs of visual and auditory stimuli were presented simultaneously (in the “synchrony” block) or with the tone lagging by a fixed time interval of 220 ms (in the “asynchrony” block; see Figure 1). In a subsequent test phase, the participants performed a simultaneity judgment (SJ) task regarding auditory and visual stimuli presented at nine different stimulus onset asynchronies (SOAs) using the method of constant stimuli (±330, ±190, ±105, ±45, or 0 ms; negative values indicate that the sound was presented first). Each SOA appeared 12 times, for each sound and condition (i.e., synchrony and asynchrony), during the experimental session. Eight re-exposure/top-up audiovisual pairs of stimuli (identical to those presented in the previous adaptation phase) were presented following every three SJ trials (see Figure 1). SJs after exposure to synchrony and asynchrony were compared in order to analyze possible recalibration effects.


Temporal adaptation to audiovisual asynchrony generalizes across different sound frequencies.

Navarra J, García-Morera J, Spence C - Front Psychol (2012)

Participants were exposed, for approximately 3 min, to audiovisual synchrony (in one block) or asynchrony [in another block; see (A,B), respectively]. The possible effects of adaptation to asynchrony were obtained in a posterior test phase in which the participants performed simultaneity judgments (SJs) regarding audiovisual stimulus pairs including the same tone as the one presented during the exposure phase (250 Hz) or else another tone (300 or 2500 Hz). Eight re-exposure audiovisual stimulus pairs (including 250 Hz tones) were presented every three SJ trials [see (C)].
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3351678&req=5

Figure 1: Participants were exposed, for approximately 3 min, to audiovisual synchrony (in one block) or asynchrony [in another block; see (A,B), respectively]. The possible effects of adaptation to asynchrony were obtained in a posterior test phase in which the participants performed simultaneity judgments (SJs) regarding audiovisual stimulus pairs including the same tone as the one presented during the exposure phase (250 Hz) or else another tone (300 or 2500 Hz). Eight re-exposure audiovisual stimulus pairs (including 250 Hz tones) were presented every three SJ trials [see (C)].
Mentions: The study was conducted in two sessions (each lasting about 45 min); one designed to test for generalization effects from 250 to 2500 Hz (that is, from one frequency range to another) and the other to test for generalization effects from 250 to 300 Hz (both falling in the same frequency range). Each session contained two different blocks, both starting with a 3-min exposure phase where pairs of visual and auditory stimuli were presented simultaneously (in the “synchrony” block) or with the tone lagging by a fixed time interval of 220 ms (in the “asynchrony” block; see Figure 1). In a subsequent test phase, the participants performed a simultaneity judgment (SJ) task regarding auditory and visual stimuli presented at nine different stimulus onset asynchronies (SOAs) using the method of constant stimuli (±330, ±190, ±105, ±45, or 0 ms; negative values indicate that the sound was presented first). Each SOA appeared 12 times, for each sound and condition (i.e., synchrony and asynchrony), during the experimental session. Eight re-exposure/top-up audiovisual pairs of stimuli (identical to those presented in the previous adaptation phase) were presented following every three SJ trials (see Figure 1). SJs after exposure to synchrony and asynchrony were compared in order to analyze possible recalibration effects.

Bottom Line: The human brain exhibits a highly adaptive ability to reduce natural asynchronies between visual and auditory signals.In the present study, we investigated whether or not temporal adaptation generalizes across different auditory frequencies.This suggests that temporal recalibration influences the audiovisual perception of sounds in a frequency non-specific manner and may imply the participation of non-primary perceptual areas of the brain that are not constrained by certain physical features such as sound frequency.

View Article: PubMed Central - PubMed

Affiliation: Fundació Sant Joan de Déu, Parc Sanitari Sant Joan de Déu - Hospital Sant Joan de Déu Esplugues de Llobregat, Barcelona, Spain.

ABSTRACT
The human brain exhibits a highly adaptive ability to reduce natural asynchronies between visual and auditory signals. Even though this mechanism robustly modulates the subsequent perception of sounds and visual stimuli, it is still unclear how such a temporal realignment is attained. In the present study, we investigated whether or not temporal adaptation generalizes across different auditory frequencies. In a first exposure phase, participants adapted to a fixed 220-ms audiovisual asynchrony or else to synchrony for 3 min. In a second phase, the participants performed simultaneity judgments (SJs) regarding pairs of audiovisual stimuli that were presented at different stimulus onset asynchronies (SOAs) and included either the same tone as in the exposure phase (a 250 Hz beep), another low-pitched beep (300 Hz), or a high-pitched beep (2500 Hz). Temporal realignment was always observed (when comparing SJ performance after exposure to asynchrony vs. synchrony), regardless of the frequency of the sound tested. This suggests that temporal recalibration influences the audiovisual perception of sounds in a frequency non-specific manner and may imply the participation of non-primary perceptual areas of the brain that are not constrained by certain physical features such as sound frequency.

No MeSH data available.


Related in: MedlinePlus