Electrophysiological evidence for the magnocellular- dorsal pathway deficit in dyslexia

Katarzyna Jednoróg , Artur Marchewka , Paweł Tacikowski , Stefan Heim , Anna Grabowska


In adults, the onset of coherent motion compared to random motion in a random dot kinematogram leads to a right hemispheric amplitude advantage of the N2 response. The source of this asymmetry is believed to lie in the motion selective MT+ cortex. Here, we tested whether the right tempo-parietal N2 component shows a similar regularity in children. In particular, we were interested in whether coherent vs. incoherent motion modulates the amplitude of N2 similarly in dyslexic and control children. We found higher N2 amplitude for coherent compared to random motion in the right hemisphere for controls but not for dyslexics. This effect was related to topographical differences of N2 amplitude for random motion between the studied groups and was accompanied by longer reaction times to random motion in dyslexic compared to control children. Furthermore, a negative correlation between the amplitude of N2 for random motion and spelling errors was observed in both groups, which is consistent with previous findings linking the magnocellular-dorsal (MD) pathway with orthographic skills. These data support the hypothesis of subtle deficiencies in the MD pathway in dyslexia.
Author Katarzyna Jednoróg
Katarzyna Jednoróg,,
, Artur Marchewka (Wydział Psychologii)
Artur Marchewka,,
- Wydział Psychologii
, Paweł Tacikowski
Paweł Tacikowski,,
, Stefan Heim
Stefan Heim,,
, Anna Grabowska (Wydział Psychologii)
Anna Grabowska,,
- Wydział Psychologii
Journal seriesDevelopmental Science, ISSN 1467-7687, [1363-755X], (A 40 pkt)
Issue year2011
Vol14 (4)
Publication size in sheets0
DOIDOI: 10.1111/j.1467-7687.2011.01037
Languageen angielski
Electrophysiological-evidence-for-the-magnocellular-dorsal-pathway-deficit-in-dyslexia.pdf of 14-09-2015
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Score (nominal)40
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Dorobek Naukowy - Preview URLhttp://dn.swps.edu.pl/Podglad.aspx?WpisID=8505
Dorobek Naukowy - Approve URLhttp://dn.swps.edu.pl/Biuro/ZatwierdzanieWpisu.aspx?WpisID=8505
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