This title appears in the Scientific Report :
2011
Please use the identifier:
http://dx.doi.org/10.1002/dys.434 in citations.
Eliciting dyslexic symptoms in proficient readers by simulating deficits in grapheme-to-phoneme conversion and visuo-magnocellular processing.
Eliciting dyslexic symptoms in proficient readers by simulating deficits in grapheme-to-phoneme conversion and visuo-magnocellular processing.
Among the cognitive causes of dyslexia, phonological and magnocellular deficits have attracted a substantial amount of research. Their role and their exact impact on reading ability are still a matter of debate, partly also because large samples of dyslexics are hard to recruit. Here, we report a ne...
Saved in:
Personal Name(s): | Tholen, N. |
---|---|
Weidner, R. / Grande, M. / Amunts, K. / Heim, S. | |
Contributing Institute: |
Strukturelle und funktionelle Organisation des Gehirns; INM-1 Kognitive Neurowissenschaften; INM-3 |
Published in: | Dyslexia, 17 (2011) S. 268 - 281 |
Imprint: |
Chichester
Wiley
2011
|
Physical Description: |
268 - 281 |
PubMed ID: |
21793123 |
DOI: |
10.1002/dys.434 |
Document Type: |
Journal Article |
Research Program: |
(Dys-)function and Plasticity Funktion und Dysfunktion des Nervensystems |
Series Title: |
Dyslexia
17 |
Subject (ZB): | |
Publikationsportal JuSER |
Among the cognitive causes of dyslexia, phonological and magnocellular deficits have attracted a substantial amount of research. Their role and their exact impact on reading ability are still a matter of debate, partly also because large samples of dyslexics are hard to recruit. Here, we report a new technique to simulate dyslexic symptoms in normal readers in two ways. Although difficulties in grapheme-to-phoneme conversion were elicited by manipulating the identifiability of written letters, visual-magnocellular processing deficits were generated by presenting letters moving dynamically on the screen. Both factors were embedded into a lexical word-pseudoword decision task with proficient German readers. Although both experimental variations systematically increased lexical decision times, they did not interact. Subjects successfully performed word-pseudoword distinctions at all levels of simulation, with consistently longer reaction times for pseudowords than for words. Interestingly, detecting a pseudoword was more difficult in the grapheme-to-phoneme conversion simulation as indicated by a significant interaction of word type and letter shape. These behavioural effects are consistent with those observed in 'real' dyslexics in the literature. The paradigm is thus a potential means of generating novel hypotheses about dyslexia, which can easily be tested with normal readers before screening and recruiting real dyslexics. |