Much of the extant research in language processing and language impairment has focused on elements of linguistic representation that are accessed and retrieved in comprehension, repetition, and production of words and sentences. These studies have provided important information about the effects of characteristics of words (e.g., frequency, imageability) and sentences (e.g., syntactic and semantic argument structure) on language processing. A smaller but nonetheless rapidly growing body of research has been directed to understanding those cognitive processes that mediate access, maintenance, and retrieval of those representations.
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