Predictors of developmental dyslexia in European orthographies with varying complexity.

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Landerl, Karin | Ramus, Franck | Moll, Kristina | Lyytinen, Heikki | Leppänen, Paavo H T | Lohvansuu, Kaisa | O'Donovan, Michael | Williams, Julie | Bartling, Jürgen | Bruder, Jennifer | Kunze, Sarah | Neuhoff, Nina | Tóth, Dénes | Honbolygó, Ferenc | Csépe, Valéria | Bogliotti, Caroline | Iannuzzi, Stéphanie | Chaix, Yves | Démonet, Jean-François | Longeras, Emilie | Valdois, Sylviane | Chabernaud, Camille | Delteil-Pinton, Florence | Billard, Catherine | George, Florence | Ziegler, Johannes C | Comte-Gervais, Isabelle | Soares-Boucaud, Isabelle | Gérard, Christophe-Loïc | Blomert, Leo | Vaessen, Anniek | Gerretsen, Patty | Ekkebus, Michel | Brandeis, Daniel | Maurer, Urs | Schulz, Enrico | van Der Mark, Sanne | Müller-Myhsok, Bertram | Schulte-Körne, Gerd

Edité par CCSD ; Wiley -

International audience. BACKGROUND: The relationship between phoneme awareness, rapid automatized naming (RAN), verbal short-term/working memory (ST/WM) and diagnostic category is investigated in control and dyslexic children, and the extent to which this depends on orthographic complexity. METHODS: General cognitive, phonological and literacy skills were tested in 1,138 control and 1,114 dyslexic children speaking six different languages spanning a large range of orthographic complexity (Finnish, Hungarian, German, Dutch, French, English). RESULTS: Phoneme deletion and RAN were strong concurrent predictors of developmental dyslexia, while verbal ST/WM and general verbal abilities played a comparatively minor role. In logistic regression models, more participants were classified correctly when orthography was more complex. The impact of phoneme deletion and RAN-digits was stronger in complex than in less complex orthographies. CONCLUSIONS: Findings are largely consistent with the literature on predictors of dyslexia and literacy skills, while uniquely demonstrating how orthographic complexity exacerbates some symptoms of dyslexia.

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