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Keywords = crossed-uncrossed difference paradigm

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17 pages, 3108 KB  
Article
Revisiting Strephosymbolie: The Connection between Interhemispheric Transfer and Developmental Dyslexia
by Roberta Daini, Paola De Fabritiis, Chiara Ginocchio, Carlo Lenti, Cristina Michela Lentini, Donatella Marzorati and Maria Luisa Lorusso
Brain Sci. 2018, 8(4), 67; https://doi.org/10.3390/brainsci8040067 - 17 Apr 2018
Cited by 8 | Viewed by 5695
Abstract
The hypothesis that an atypical hemispheric specialization is associated to developmental dyslexia (DD) is receiving renewed interest, lending some support to Orton’s theory. In this article, we investigated whether interhemispheric transfer processes (IHT) are likely to be involved in developmental dyslexia. In this [...] Read more.
The hypothesis that an atypical hemispheric specialization is associated to developmental dyslexia (DD) is receiving renewed interest, lending some support to Orton’s theory. In this article, we investigated whether interhemispheric transfer processes (IHT) are likely to be involved in developmental dyslexia. In this study, we tested 13 children with developmental dyslexia and 13 matched controls (aged 8 to 13 years) in four different tasks. In a tactile transfer task, the dyslexic children’s performance was less accurate. In a standard Poffenberger paradigm, dyslexic children performed slower than the controls in all conditions and did not show any difference between crossed and uncrossed conditions. Furthermore, they showed an increased asymmetry of performance according to the responding hand, while controls gave more coherent responses. In a visual task of object orientation discrimination, dyslexic children had slower Response Times (RTs) than controls, especially for mirror-reversed objects in the right visual field. Finally, a higher number of dyslexic children showed mirror-drawing or mirror-writing with respect to controls. Our results as a whole show that children with DD are impaired in interhemispheric transfer, although the differences in performance among dyslexic individuals suggest the impairment of different psychophysiological mechanisms. As such, a common origin in terms of connectivity problems is proposed. Full article
(This article belongs to the Special Issue Dyslexia, Dysgraphia and Related Developmental Disorders)
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