Neural correlates of intersensory processing in 5-month-old infants

Two experiments assessing event‐related potentials in 5‐month‐old infants were conducted to examine neural correlates of attentional salience and efficiency of processing of a visual event (woman speaking) paired with redundant (synchronous) speech, nonredundant (asynchronous) speech, or no speech....

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Bibliographic Details
Published in:Developmental psychobiology 2014-04, Vol.56 (3), p.355-372
Main Authors: Reynolds, Greg D., Bahrick, Lorraine E., Lickliter, Robert, Guy, Maggie W.
Format: Article
Language:English
Subjects:
Acoustic Stimulation
attention
Attention - physiology
Auditory Perception - physiology
Cerebral Cortex - physiology
Child Development
event-related potentials
Evoked Potentials - physiology
Female
Humans
infancy
Infant
intersensory perception
Male
Photic Stimulation
Visual Perception - physiology
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Summary:Two experiments assessing event‐related potentials in 5‐month‐old infants were conducted to examine neural correlates of attentional salience and efficiency of processing of a visual event (woman speaking) paired with redundant (synchronous) speech, nonredundant (asynchronous) speech, or no speech. In Experiment 1, the Nc component associated with attentional salience was greater in amplitude following synchronous audiovisual as compared with asynchronous audiovisual and unimodal visual presentations. A block design was utilized in Experiment 2 to examine efficiency of processing of a visual event. Only infants exposed to synchronous audiovisual speech demonstrated a significant reduction in amplitude of the late slow wave associated with successful stimulus processing and recognition memory from early to late blocks of trials. These findings indicate that events that provide intersensory redundancy are associated with enhanced neural responsiveness indicative of greater attentional salience and more efficient stimulus processing as compared with the same events when they provide no intersensory redundancy in 5‐month‐old infants. © 2013 Wiley Periodicals, Inc. © 2013 Wiley Periodicals, Inc. Dev Psychobiol 56: 355–372, 2014.
ISSN:0012-1630
1098-2302
DOI:10.1002/dev.21104