The relative incidence of lexical and grammatical errors in oral reading was studied in three experiments on a group of twenty-eight dysphasic patients. In the first, lexical items were presented in isolation, in groups and in clauses; in the second and third, lexical and grammatical items were presented in isolation and embedded in continuous prose. Although no conclusive evidence was found of independent breakdown of lexical and grammatical functions, in two cases impairment was predominantly lexical and in two cases predominantly grammatical.
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