The neural basis of speech parsing in children and adults.

TitleThe neural basis of speech parsing in children and adults.
Publication TypeJournal Article
Year of Publication2010
AuthorsMcNealy, K, Mazziotta JC, Dapretto M
JournalDevelopmental science
Volume13
Issue2
Pagination385-406
Date Published2010 Mar
ISSN1467-7687
KeywordsAdult, cerebral cortex, Child, Female, Humans, Los Angeles, Male, Phonetics, Speech Perception, Temporal Lobe, Young Adult
Abstract

Word segmentation, detecting word boundaries in continuous speech, is a fundamental aspect of language learning that can occur solely by the computation of statistical and speech cues. Fifty-four children underwent functional magnetic resonance imaging (fMRI) while listening to three streams of concatenated syllables that contained either high statistical regularities, high statistical regularities and speech cues, or no easily detectable cues. Significant signal increases over time in temporal cortices suggest that children utilized the cues to implicitly segment the speech streams. This was confirmed by the findings of a second fMRI run, in which children displayed reliably greater activity in the left inferior frontal gyrus when listening to 'words' that had occurred more frequently in the streams of speech they had just heard. Finally, comparisons between activity observed in these children and that in previously studied adults indicate significant developmental changes in the neural substrate of speech parsing.

DOI10.1111/j.1751-7893.2009.00137.x
Alternate JournalDev Sci