Harm, Michael W. and Seidenberg, Mark S. (2001)

Are there Orthographic Impairments in Phonological Dyslexia?

Cognitive Neuropsychology, Vol 18(1), pp. 71-92 Click here for a BibTeX entry.

Abstract: Two hypotheses have been advanced concerning the basis of acquired phonological dyslexia. According to the dual-route model, the pattern derives from impaired grapheme-phoneme conversion. According to the phonological impairment hypothesis, it derived from impaired representation and use of phonology. Effects of graphemic complexity and visual similarity observed in studies by Howard and Best (1996), orthographic effects on phoneme counting (Berndt et al. 1996) and data from patient LB (Derouesne and Beauvois 1985) have been taken as evidence for an orthographic impairment in phonological dyslexia and therefore against the impaired phonology hypothesis (Coltheart 1996). We present a computational simulation, results of two behavioral studies and a critical analysis of the MJ and LB data which suggest that the "orthographic" deficits in such patients arise from phonological impairments that interact with orthographic properties of stimuli.

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