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Differences in effective connectivity between dyslexic children and normal readers during a pseudoword reading task: An fMRI study

Abstract : Purpose.—This fMRI study investigated phonological and lexicosemantic processing in dyslexic and in chronological age- and reading level-matched children in a pseudoword reading task. Materials and methods.—The effective connectivity network was compared between the three groups using a structural model including the supramarginal cortex (BA 40; BA: Brodmann area), fusiform cortex (BA 37) and inferior frontal cortex (BA 44/45) areas of the left hemisphere. Results.—The results revealed differences in connectivity patterns. In dyslexic patients, in contrast with chronological age- and reading level-matched groups, no causal relationship was demonstrated between BA 40 and BA 44/45. However, a significant causal relationship was demonstrated between BA 37 and BA 44/45 both in dyslexic children and in the reading levelmatched group. Conclusions.—These findings were interpreted as evidence for a phonological deficit in developmental dyslexia
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V. Quaglino, B. Bourdin, G. Czternasty, P. Vrignaud, S. Fall, et al.. Differences in effective connectivity between dyslexic children and normal readers during a pseudoword reading task: An fMRI study. Neurophysiologie Clinique/Clinical Neurophysiology, Elsevier Masson, 2008, 38 (2), pp.73-82. ⟨10.1016/j.neucli.2007.12.007⟩. ⟨hal-02310864⟩

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