The recalibration patterns of perceptual synchrony and multisensory integration after exposure to asynchronous speech

•Perceptual synchrony and McGurk effect were recalibrated toward the temporal lag.•Recalibration aftereffects of perceptual synchrony and McGurk effect were not correlated.•Recalibrated McGurk effect more apparently increased at the direction of the temporal lag.•Perceptual synchrony and multisensor...

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Bibliographic Details
Published in:Neuroscience letters 2014-05, Vol.569, p.148-152
Main Authors: Yuan, Xiangyong, Bi, Cuihua, Yin, Huazhan, Li, Baolin, Huang, Xiting
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Adaptation
Female
Humans
Judgment
Male
McGurk effect
Multisensory integration
Perceptual synchrony
Photic Stimulation
Speech
Speech Perception
Temporal recalibration
Time Factors
Visual Perception
Young Adult
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Summary:•Perceptual synchrony and McGurk effect were recalibrated toward the temporal lag.•Recalibration aftereffects of perceptual synchrony and McGurk effect were not correlated.•Recalibrated McGurk effect more apparently increased at the direction of the temporal lag.•Perceptual synchrony and multisensory integration recalibration have similarities and differences. Perceptual synchrony and multisensory integration both vary as a function of stimulus onset asynchrony, but evidences from behavioral, patient, and lesion studies all support some dissociation between these two processes. Although it has been found that both perceptual synchrony and multisensory integration are recalibrated after exposure to asynchronous multisensory stimuli, no studies have directly compared these two recalibration patterns. We addressed this by using McGurk speech and requiring participants to perform simultaneity judgments and a syllable identification task in separate sessions. The results revealed that after exposure to asynchrony, both perceptual synchrony and McGurk fusion shifted toward the temporal lag. The recalibration aftereffects (i.e., the magnitude of shifts) of these two processes have no significant difference and correlation. In addition, McGurk fusion increased strongly at the direction of the temporal lag, which could not be fully explained by fusion shifts. Thus, the present research implies that recalibration patterns of explicit and implicit timing represented by perceptual synchrony and multisensory integration have both similarity and difference.
ISSN:0304-3940
1872-7972
DOI:10.1016/j.neulet.2014.03.057