The representation of sublexical orthographic-phonologic correspondences: evidence from phonological dyslexia.
Although there is considerable evidence that grapheme and body units are involved in assembling phonology from print, there is little evidence supporting the involvement of syllabic representations. We provide evidence on this point from a phonological dyslexic patient (ML) who, as a result of brain damage, is relatively unable to read nonwords. ML was found to be able to perform tasks assumed to reflect processes involved in assembled phonology (i.e. segmentation, orthographic-phonologic conversion, and blending) when the units involved were syllables, but demonstrated considerable difficulty when they were onset, body, or phoneme units. Additionally, both ML and matched controls were much better able to find words in an anagrams task (Treiman & Chafetz, 1987) when they resulted from the combination of segments corresponding to syllables than when they did not. It is suggested that the relationship between print and sound is represented at multiple levels (including the syllable) (Shallice, Warrington, & McCarthy, 1983) and that ML's nonword reading impairment is the result of disruption of representations below the level of the syllable.
Lesch
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MF
Rice University, Psychology Department, Houston, TX 77005-1892, USA. lesch@rice.edu
Martin
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RC
D000849:Anomia / Q000175:diagnosis / Q000523:psychology; D001039:Aphasia, Broca / Q000175:diagnosis / Q000523:psychology; D001925:Brain Damage, Chronic / Q000175:diagnosis* / Q000523:psychology; D002544:Cerebral Infarction / Q000175:diagnosis / Q000523:psychology; D004292:Dominance, Cerebral; D004411:Dyslexia, Acquired / Q000175:diagnosis* / Q000523:psychology; D006801:Humans; D008297:Male; D011939:Mental Recall; D008875:Middle Aged; D009483:Neuropsychological Tests; D010700:Phonetics; D012660:Semantics