Impaired Letter-String Processing in Developmental Dyslexia: What Visual-to-Phonology Code Mapping Disorder?
Poor parallel letter-string processing in developmental dyslexia was taken as evidence of poor visual attention (VA) span, that is, a limitation of visual attentional resources that affects multi-character processing. However, the use of letter stimuli in oral report tasks was challenged on its capa...
| Publicado en: | Dyslexia (10769242) Vol. 18; no. 2; pp. 77 - 94 |
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| Autores principales: | , , |
| Formato: | research Journal Article |
| Publicado: |
Wiley-Blackwell
May2012
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104547014&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104547014 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 10769242 TR4 jtl: Dyslexia (10769242) issn: 10769242 maglogo: Y pubinfo: dt: May2012 vid: 18 iid: 2 pid: 480 pub: Wiley-Blackwell place: Malden, Massachusetts artinfo: ui: 104547014 2011510803 10.1002/dys.1437 NLM22434589 104547014 ppf: 77 ppct: 17 formats: tig: atl: Impaired Letter-String Processing in Developmental Dyslexia: What Visual-to-Phonology Code Mapping Disorder? aug: au: Valdois S Lassus-Sangosse D Lobier M affil: Laboratoire de Psychologie et NeuroCognition (UMR CNRS 5105), Grenoble, France; Centre National de la Recherche Scientifique (CNRS), Grenoble, France; Université Pierre Mendès-France (UPMF), Grenoble, France. Sylviane.Valdois@upmf-grenoble.fr. sug: subj: Attention Deficit Hyperactivity Disorder Etiology Dyslexia Complications Phonetics Reading Visual Perception Physiology Adolescence Analysis of Variance Attention Deficit Hyperactivity Disorder Diagnosis Case Control Studies Child Child, Preschool Color Perception Female Human Male Neuropsychological Tests Visual Perception Statistics Adolescent: 13-18 years Child: 6-12 years Child, Preschool: 2-5 years Female Male ab: Poor parallel letter-string processing in developmental dyslexia was taken as evidence of poor visual attention (VA) span, that is, a limitation of visual attentional resources that affects multi-character processing. However, the use of letter stimuli in oral report tasks was challenged on its capacity to highlight a VA span disorder. In particular, report of poor letter/digit-string processing but preserved symbol-string processing was viewed as evidence of poor visual-to-phonology code mapping, in line with the phonological theory of developmental dyslexia. We assessed here the visual-to-phonological-code mapping disorder hypothesis. In Experiment 1, letter-string, digit-string and colour-string processing was assessed to disentangle a phonological versus visual familiarity account of the letter/digit versus symbol dissociation. Against a visual-to-phonological-code mapping disorder but in support of a familiarity account, results showed poor letter/digit-string processing but preserved colour-string processing in dyslexic children. In Experiment 2, two tasks of letter-string report were used, one of which was performed simultaneously to a high-taxing phonological task. Results show that dyslexic children are similarly impaired in letter-string report whether a concurrent phonological task is simultaneously performed or not. Taken together, these results provide strong evidence against a phonological account of poor letter-string processing in developmental dyslexia. Copyright © 2012 John Wiley & Sons, Ltd. KEY MESSAGES: Poor letter/digit-string processing in dyslexia can follow from either a phonological or a visual attention span disorder. The dissociation between letter/digit versus symbol-string processing was viewed as supporting the phonological account. Using three nameable stimuli types, Experiment 1 shows poor letter/digit-string processing but preserved colour-string processing in developmental dyslexia. Experiment 2 shows that the dyslexic's low performance in letter-string processing is not affected by a concurrent phonological task. These findings speak against a phonological interpretation of the disorder. The observed dissociation may well reflect a visual familiarity effect. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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