Effects of lexicality and word frequency on brain activation in dyslexic readers  

Oleh:

Heim, Stefan ; Wehnelt, Anke ; Grande, Marion ; Huber, Walter ; Amunts, Katrin

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Brain and Language (Full Text) vol. 125 no. 2 (2013), page 194-202.
Topik: Reading disability; Left hemisphere; Inferior frontal gyrus; IFG; STG; Phonology; Compensation; Dyslexia; Lexical access
Fulltext: 125_02_Heim.pdf (1.52MB)

Isi artikel

We investigated the neural basis of lexical access to written stimuli in adult dyslexics and normal readers via the Lexicality effect (pseudowords>words)and the Frequency effect (low>high frequent words). The participa nts read aloud German words (withlow or high lexical frequency)or pseudowords while being scanned. In both groups,both Lexicality effect and Frequency effect involved Broca’s region (areas 44 and 45).Whereas the effects were stronger for dyslexic than normal reade rs in area 44,area 45 showed the reverse pattern.These findingsmimic recent results from an fMRI study on dyslexic primary school children, indicating that lexical access to written stimuli poses increased and enduring difficulties on dyslexic readers, at least in alanguage with atransparent orthography.Additionally,data from four comp ensated adult dyslexics are reported and discussed,which hint at the importance of both Broca’s and Wernicke’s region for recovery from childh ood dyslexia.

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