Distinct neural signatures of cognitive subtypes of dyslexia: Effects of lexicality during phonological processing

• Autorzy: van Ermingen-Marbach M. , Pape-Neumann J. , Grande M. , Grabowska A. , Heim S.
• Języki publikacji: EN

Abstrakty

EN

The present study investigates the neurobiological basis of two subtypes of dyslexia with either a double deficit (concerning phonological awareness and rapid naming) or a single rapid naming deficit. We compared such groups of German dyslexic primary school children to each other and with good reading children in a phoneme deletion task performed during fMRI scanning. Children heard German words or pseudowords and repeated the remainder of the stimulus while deleting the initial phoneme (e.g. tear - _ear). In four conditions, the input stimulus (word or pseudoword) could either become another word or pseudoword as output. The word-word condition stuck out against all other conditions involving pseudowords: Dyslexics with a double deficit showed a strong response in left areas 44 and 45 in Boca's region, whereas dyslexics with rapid naming difficulties revealed a contralateral effect in right areas 44 and 45. These findings, which were obtained without presenting written or pictorial stimuli, reveal that a double deficit in dyslexia is not the sum of single deficits, but rather involves the interaction of lexical and phonological processing, making strong demands on the left inferior frontal cortex. In general, the results stress the importance of considering subtypes of dyslexia differentially in order to obtain better insights in the neurocognitive mechanisms of impaired and successful reading.

• Wydawca: -
• Czasopismo: Acta Neurobiologiae Experimentalis
• Rocznik: 2013
• Tom: 73
• Numer: 3
• Opis fizyczny: p.404-416,fig.,ref.

Twórcy

autor

van Ermingen-Marbach M.

• Department of Psychiatry, Psychotherapy and Psychosomatics, Medical School, Section Structural-Functional Brain Mapping, RWTH Aachen University, Aachen, Germany
• JARA-Translation Brain Medicine, Julich and Aachen, Germany

autor

Pape-Neumann J.

• Department of Neurology, Medical School, Section Neurological Cognition Research, RWTH Aachen University, Aachen, Germany

autor

Grande M.

• JARA-Translation Brain Medicine, Julich and Aachen, Germany
• Department of Neurology, Medical School, Section Neurological Cognition Research, RWTH Aachen University, Aachen, Germany

autor

Grabowska A.

• Department of Psychophysiology, Nencki Institute of Experimental Biology, PAS, Warsaw, Poland
• Warsaw School of Social Psychology and Humanities, Warsaw, Poland

autor

Heim S.

• Department of Psychiatry, Psychotherapy and Psychosomatics, Medical School, Section Structural-Functional Brain Mapping, RWTH Aachen University, Aachen, Germany
• JARA-Translation Brain Medicine, Julich and Aachen, Germany
• Department of Neurology, Medical School, Section Neurological Cognition Research, RWTH Aachen University, Aachen, Germany
• Institute of Neuroscience and Medicine (INM-1), Research Centre Julich, Julich, Germany

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