Spelling dyslexia: a deficit of the visual word-form.
A patient with spelling dyslexia read both words and text accurately but slowly and laboriously letter by letter. Her performance on a test of lexical decision was slow. She had great difficulty in detecting a 'rogue' letter attached to the beginning or end of a word--for example, ksong--or in parsing two unspaced words, such as applepeach. By contrast she was immune to the effects of interpolating extraneous coloured letters in a word, a manipulation that affects normal readers. Therefore it is argued that this patient had damage to an early stage in the reading process, to the visual word form itself.
Warrington
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National Hospital for Neurology and Neurosurgery, London, UK.
Langdon
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D002544:Cerebral Infarction / Q000150:complications* / Q000000981:diagnostic imaging; D004411:Dyslexia, Acquired / Q000209:etiology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D009778:Occipital Lobe / Q000000981:diagnostic imaging; D010296:Parietal Lobe / Q000000981:diagnostic imaging; D011932:Reading; D014057:Tomography, X-Ray Computed