Are there Orthographic Impairments in Phonological Dyslexia?
Cognitive Neuropsychology, Vol 18(1), pp. 71-92
for a BibTeX entry.
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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