Document Detail

Development of hemispheric specialization for lexical pitch-accent in Japanese infants.
MedLine Citation:
PMID:  19925204     Owner:  NLM     Status:  MEDLINE    
Infants' speech perception abilities change through the first year of life, from broad sensitivity to a wide range of speech contrasts to becoming more finely attuned to their native language. What remains unclear, however, is how this perceptual change relates to brain responses to native language contrasts in terms of the functional specialization of the left and right hemispheres. Here, to elucidate the developmental changes in functional lateralization accompanying this perceptual change, we conducted two experiments on Japanese infants using Japanese lexical pitch-accent, which changes word meanings with the pitch pattern within words. In the first behavioral experiment, using visual habituation, we confirmed that infants at both 4 and 10 months have sensitivities to the lexical pitch-accent pattern change embedded in disyllabic words. In the second experiment, near-infrared spectroscopy was used to measure cortical hemodynamic responses in the left and right hemispheres to the same lexical pitch-accent pattern changes and their pure tone counterparts. We found that brain responses to the pitch change within words differed between 4- and 10-month-old infants in terms of functional lateralization: Left hemisphere dominance for the perception of the pitch change embedded in words was seen only in the 10-month-olds. These results suggest that the perceptual change in Japanese lexical pitch-accent may be related to a shift in functional lateralization from bilateral to left hemisphere dominance.
Yutaka Sato; Yuko Sogabe; Reiko Mazuka
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of cognitive neuroscience     Volume:  22     ISSN:  1530-8898     ISO Abbreviation:  J Cogn Neurosci     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-07-16     Completed Date:  2010-11-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8910747     Medline TA:  J Cogn Neurosci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2503-13     Citation Subset:  IM    
Laboratory for Language Development, RIKEN Brain Science Institute, Wako-shi, Saitama, Japan.
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MeSH Terms
Acoustic Stimulation / methods
Age Factors
Analysis of Variance
Asian Continental Ancestry Group
Brain Mapping*
Cerebral Cortex / anatomy & histology,  metabolism,  physiology*
Dominance, Cerebral / physiology*
Hemoglobins / metabolism
Pitch Perception / physiology*
Reaction Time / physiology
Spectroscopy, Near-Infrared / methods
Time Factors
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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