The association of macro- and microstructure of the corpus callosum and language lateralisation.
The present study aimed to examine how differences in functional lateralisation of language are related to interindividual variations in interhemispheric connectivity. Utilising an fMRI silent word-generation paradigm, 89 left- and right-handed subjects were subdivided into four lateralisation subgroups. Applying morphological and diffusion-tensor MRI, midsagittal cross-sectional area as well as quantitative measures of molecular diffusion (anisotropy, mean diffusion) of the corpus callosum were determined to assess interhemispheric connectivity. Statistical analyses revealed group differences in molecular diffusion but not in callosal size, which may be interpreted to reflect a stronger and/or faster interhemispheric connection in strongly left-lateralised subjects as compared to moderately left-lateralised, bilateral, or moderately right-lateralised subjects.
Westerhausen
René
R
Center for Neuropsychological Research, University of Trier, Germany. westerhausen@znf.uni-trier.de
Kreuder
Frank
F
Dos Santos Sequeira
Sarah
S
Walter
Christof
C
Woerner
Wolfgang
W
Wittling
Ralf Arne
RA
Schweiger
Elisabeth
E
Wittling
Werner
W
D000328:Adult; D003337:Corpus Callosum / Q000033:anatomy & histology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D007802:Language; D008279:Magnetic Resonance Imaging; D008297:Male; D014705:Verbal Behavior