Neurophysiological correlates of word processing deficits in isolated reading and isolated spelling disorders

In English speaking countries, developmental dyslexia (DD) is primarily defined as a reading disorder which is characterized by deficits in word reading accuracy, that are frequently accompanied by spelling problems. The association between reading and spelling deficits is in line with theories of literacy development that generally assume a close, bidirectional relationship between reading and spelling development (e.g. Frith, 1985), with correlation scores of .77-.86 between the two domains (for a review see Ehri, 1997).

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