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A visual processing but no phonological disorder in a child with mixed dyslexia.

Abstract : The case study of Martial, a French 9-year-old boy, who exhibits severe mixed dyslexia and surface dysgraphia is reported. Despite very poor pseudo-word reading, Martial has preserved phonological processing skills as his good oral language, good phoneme awareness and good verbal short-term memory show. He exhibited a strong length effect when reading briefly presented words but no sign of mini-neglect. His letter-string processing abilities were assessed through tasks of whole and partial report. In whole report, Martial could only name a few letters from briefly displayed 5-consonant strings. He showed an initial-position advantage and a sharper than expected left-to-right gradient of performance. He performed better when asked to report a single cued letter within the string but then showed an atypical right-side advantage. The same rightward attentional bias was observed in whole report when top-down control was prevented. Otherwise, Martial showed preserved single letter identification skills and good processing of 5-letter strings when letters were sequentially displayed one at a time. His poor letter-string processing thus reflects a parallel visual processing disorder that is compatible with either a visual attention (VA) span or a visual short-term memory disorder. Martial was further engaged in a complex reaching movement task involving VA and simultaneous processing. He performed motor sequences not as a whole but as a succession of independent motor units, suggesting that his attention was not allocated in parallel to the two to-be-reached targets prior to movement execution. Against a more basic motor disorder however, he showed good performance in a task of cyclical pointing movements. The overall findings suggest that Martial suffers from a visual simultaneous processing disorder that disturbs letter identification in strings. Instead of being restricted to letter-string processing, this VA disorder might extend to non-verbal task.
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Contributor : Christine Cannard <>
Submitted on : Monday, March 24, 2014 - 6:49:12 PM
Last modification on : Thursday, March 26, 2020 - 9:02:03 AM



Sylviane Valdois, Christel Bidet-Ildei, Delphine Lassus-Sangosse, Caroline Reilhac, Marie-Ange N'Guyen-Morel, et al.. A visual processing but no phonological disorder in a child with mixed dyslexia.. Cortex, Elsevier, 2011, 47 (10), pp.1197-218. ⟨10.1016/j.cortex.2011.05.011⟩. ⟨hal-00965218⟩



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