Abstract:
:The development of language hemispheric specialization is not well understood in young children, especially regarding expressive language functions. In this study, we investigated age-related changes in expressive language lateralization patterns in a population of children (3-6 and 7-10 years old), adolescents (11-16 years old), and young adults (19-30 years old). During functional near-infrared spectroscopy recordings, all participants performed a verbal fluency task, which consisted in naming as many words as possible belonging to a given semantic category. Hemoglobin concentration changes were measured in bilateral frontal and temporal cortical areas. During the language task, results showed a strong left hemisphere response along with weaker right hemisphere activation in all groups. Age-related increases in hemodynamic responses were found bilaterally, with younger children showing smaller hemodynamic responses than adolescents and adults in both hemispheres. Overall, these findings confirm that a left hemisphere specialization is already established in young children and persists through adulthood. Early left hemisphere specialization for expressive language suggests that language development hinges on structural and functional properties of the human brain with little reorganization occurring with development.
journal_name
Neuropsychologiajournal_title
Neuropsychologiaauthors
Paquette N,Lassonde M,Vannasing P,Tremblay J,González-Frankenberger B,Florea O,Béland R,Lepore F,Gallagher Adoi
10.1016/j.neuropsychologia.2015.01.007subject
Has Abstractpub_date
2015-02-01 00:00:00pages
117-25eissn
0028-3932issn
1873-3514pii
S0028-3932(15)00014-7journal_volume
68pub_type
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