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Is Dyslexia a Brain Disorder?
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Brain Sci. 2018, 8(4), 67;

Revisiting Strephosymbolie: The Connection between Interhemispheric Transfer and Developmental Dyslexia

Department of Psychology, and Milan Center for Neuroscience (NeuroMI), Università di Milano-Bicocca, 20126 Milano, Italy
University Research Centre in Optics and Optometry, Università di Milano-Bicocca (COMiB), 20126 Milano, Italy
U.O. Neuropsichiatria Dell’infanzia e Dell’adolescenza ASST Santi PaoloCarlo, 20126 Milano, Italy
Scientific Institute IRCCS E. Medea, 22040 Bosisio Parini (LC), Italy
Author to whom correspondence should be addressed.
Received: 28 February 2018 / Revised: 6 April 2018 / Accepted: 12 April 2018 / Published: 17 April 2018
(This article belongs to the Special Issue Dyslexia, Dysgraphia and Related Developmental Disorders)
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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. View Full-Text
Keywords: interhemispheric transfer; developmental dyslexia; mirror writing; crossed-uncrossed difference paradigm interhemispheric transfer; developmental dyslexia; mirror writing; crossed-uncrossed difference paradigm

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Daini, R.; De Fabritiis, P.; Ginocchio, C.; Lenti, C.; Lentini, C.M.; Marzorati, D.; Lorusso, M.L. Revisiting Strephosymbolie: The Connection between Interhemispheric Transfer and Developmental Dyslexia. Brain Sci. 2018, 8, 67.

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