Document Detail

Interhemispheric temporal lobe connectivity predicts language impairment in adolescents born preterm.
MedLine Citation:
PMID:  23144265     Owner:  NLM     Status:  MEDLINE    
Although language difficulties are common in children born prematurely, robust neuroanatomical correlates of these impairments remain to be established. This study investigated whether the greater prevalence of language problems in preterm (versus term-born) children might reflect injury to major intra- or interhemispheric white matter pathways connecting frontal and temporal language regions. To investigate this, we performed a comprehensive assessment of language and academic abilities in a group of adolescents born prematurely, some of whom had evidence of brain injury at birth (n = 50, mean age: 16 years, mean gestational age: 27 weeks) and compared them to a term-born control group (n = 30). Detailed structural magnetic resonance imaging and diffusion-tractography analyses of intrahemispheric and interhemispheric white matter bundles were performed. Analysis of intrahemispheric pathways included the arcuate fasciculus (dorsal language pathway) and uncinate fasciculus/extreme capsule (ventral language pathway). Analysis of interhemispheric pathways (in particular, connections between the temporal lobes) included the two major commissural bundles: the corpus callosum and anterior commissure. We found language impairment in 38% of adolescents born preterm. Language impairment was not related to abnormalities of the arcuate fasciculus (or its subsegments), but was associated with bilateral volume reductions in the ventral language pathway. However, the most significant volume reduction was detected in the posterior corpus callosum (splenium), which contains interhemispheric connections between the occipital, parietal and temporal lobes. Diffusion tractography showed that of the three groups of interhemispheric fibres within the splenium, only those connecting the temporal lobes were reduced. Crucially, we found that language impairment was only detectable if the anterior commissure (a second temporal lobe commissural pathway) was also small. Regression analyses showed that a combination of anatomical measures of temporal interhemispheric connectivity (through the splenium of the corpus callosum and anterior commissure) explained 57% of the variance in language abilities. This supports recent theories emphasizing the importance of interhemispheric connections for language, particularly in the developing brain.
Gemma B Northam; Frédérique Liégeois; Jacques-Donald Tournier; Louise J Croft; Paul N Johns; Wui K Chong; John S Wyatt; Torsten Baldeweg
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-11-11
Journal Detail:
Title:  Brain : a journal of neurology     Volume:  135     ISSN:  1460-2156     ISO Abbreviation:  Brain     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-19     Completed Date:  2013-02-15     Revised Date:  2014-05-29    
Medline Journal Info:
Nlm Unique ID:  0372537     Medline TA:  Brain     Country:  England    
Other Details:
Languages:  eng     Pagination:  3781-98     Citation Subset:  AIM; IM    
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MeSH Terms
Analysis of Variance
Brain Mapping*
Corpus Callosum / pathology*
Diffusion Tensor Imaging
Educational Status
Follow-Up Studies
Functional Laterality / physiology*
Image Processing, Computer-Assisted
Language Development Disorders / diagnosis*
Magnetic Resonance Imaging
Neural Pathways / pathology
Predictive Value of Tests
Temporal Lobe / pathology*

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

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