Interaction of Phonological Awareness and "Magnocellular" Processing during Normal and Dyslexic Reading: Behavioural and fMRI Investigations

Autor/inn/en	Heim, Stefan; Grande, Marion; Pape-Neumann, Julia; van Ermingen, Muna; Meffert, Elisabeth; Grabowska, Anna; Huber, Walter; Amunts, Katrin
Titel	Interaction of Phonological Awareness and "Magnocellular" Processing during Normal and Dyslexic Reading: Behavioural and fMRI Investigations
Quelle	In: Dyslexia, 16 (2010) 3, S.258-282 (25 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1076-9242
DOI	10.1002/dys.409
Schlagwörter	Diagnostic Tests; Dyslexia; Phonological Awareness; Motion; Auditory Discrimination; Multivariate Analysis; Reading Ability; Brain Hemisphere Functions; Reading Processes; Control Groups; Task Analysis + Suchen Sie Ihr Suchwort? Diagnostic test; Diagnostischer Test; Dyslexics; Legasthenie; Lese-Rechtschreib-Schwäche; Bewegungsablauf; Multivariate Analyse; Reading competence; Lesekompetenz; Leseprozess; Aufgabenanalyse
Abstract	We investigated whether phonological deficits are a consequence of magnocellular processing deficits in dyslexic and control children. In Experiment 1, children were tested for reading ability, phonological awareness, visuo-magnocellular motion perception, and attention shifting (sometimes considered as magnocellular function). A two-step cluster analysis of the behavioural scores revealed four clusters of children. Phonological awareness was correlated with attention (cluster #1) or motion detection (cluster #2), whereas attention and motion detection were correlated in cluster #3. In cluster #4, all variables were uncorrelated. In Experiment 2, the same variables plus auditory discrimination were tested with fMRI in a sub-sample of Experiment 1. Although dyslexics had reduced activation in visual or auditory cortex during motion detection or auditory discrimination, respectively, they had increased right frontal activation in areas 44 and 45 in all "magnocellular" (including auditory) tasks. In contrasts, during phonological decisions, there was higher activation for good readers than dyslexics in left areas 44 and 45. Together, the two experiments give insight into the interplay of phonological and magnocellular processing during reading. Distinct left versus right frontal effects reveal partly different underlying neural mechanisms. These data contradict the view that phonological processing deficits in dyslexia necessarily result from impaired magnocellular functioning. (Contains 3 notes and 6 figures.) (As Provided).
Anmerkungen	John Wiley & Sons, Inc. 111 River Street, Hoboken, NJ 07030-5774. Tel: 800-825-7550; Tel: 201-748-6645; Fax: 201-748-6021; e-mail: subinfo@wiley.com; Web site: http://www.wiley.com/WileyCDA/WileyTitle/productCd-DYS.html
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10