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Acquired phonological and deep dyslexia.
LAMBON RALPH, M.A. & GRAHAM, N.L.
Neurocase, 2000, 6(2), 141-178
Year of publication:
Aphasic patients with deep dyslexia present with a number of generally co-occuring features or symptoms (Coltheart, 1980a). Besides the principal characteristic - production of semantic paralexia (eg producing 'talk' to the target speak) - the features also include visual and derivational paralexia (eg deep ' 'deer'; depth ' 'deep'), function word substitutions (eg her ' 'she'), an almost complete inability to derive phonology directly from print (ie read non-words), reading accuracy is affected by imageability/concreteness (highly imageable/concrete better than low imageable/abstract words) and by the part of speech (typically, nouns>adjectives>verbs>functors). Deep dyslexia has been described most often in patients with Broca's aphasia who have a severe expressive aphasia but relatively good comprehension, poor short-term memory and inability to manipulate phonological information. Writing is also impaired and some patients present with both deep dyslexia and dysgraphia (eg Nolan and Caramazza, 1983, P661). The critical feature of phonological dyslexia is the presence of a lexicality effect on reading accuracy (ie word>non-word reading). Many features listed above for deep dyslexia are found in patients with phonological dyslexia although this varies across individuals. In effect the presence of semantic paralexia is the differential diagnostic between phonological and deep dyslexia although this varies across individuals. In effect the presence of semantic paralexia is the differential diagnostic between phonological and deep dyslexia.