Document Detail


Role of the superior parietal lobules in letter-identity processing within strings: FMRI evidence from skilled and dyslexic readers.
MedLine Citation:
PMID:  23270676     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Traditionally, the ventral occipito-temporal (vOT) area, but not the superior parietal lobules (SPLs), is thought as belonging to the neural system of visual word recognition. However, some dyslexic children who exhibit a visual attention span disorder - i.e. poor multi-element parallel processing - further show reduced SPLs activation when engaged in visual multi-element categorization tasks. We investigated whether these parietal regions further contribute to letter-identity processing within strings. Adult skilled readers and dyslexic participants with a visual attention span disorder were administered a letter-string comparison task under fMRI. Dyslexic adults were less accurate than skilled readers to detect letter identity substitutions within strings. In skilled readers, letter identity differences related to enhanced activation of the left vOT. However, specific neural responses were further found in the superior and inferior parietal regions, including the SPLs bilaterally. Two brain regions that specifically related to substituted letter detection, the left SPL and the left vOT, were less activated in dyslexic participants. These findings suggest that the left SPL, like the left vOT, may contribute to letter string processing.
Authors:
Caroline Reilhac; Carole Peyrin; Jean-François Démonet; Sylviane Valdois
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-24
Journal Detail:
Title:  Neuropsychologia     Volume:  -     ISSN:  1873-3514     ISO Abbreviation:  Neuropsychologia     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0020713     Medline TA:  Neuropsychologia     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Ltd.
Affiliation:
INSERM, Imagerie Cérébrale et Handicaps neurologique, UMRS 825, F- 31059, Toulouse, France; Université de Toulouse, UPS, Imagerie Cérébrale et Handicaps neurologique, UMRS 825, F- 31059, Toulouse, France. Electronic address: caroline.reilhac@gmail.com.
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