Mechanisms underlying writing and speech in aphasia |
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Authors: | Angela D. Friederici Paul W. Schoenle Harold Goodglass |
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Affiliation: | Aphasia Research Center, Boston Veterans Administration Medical Center, and Department of Neurology, Boston University USA |
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Abstract: | As a parallel to the dual decoding concept for processing of written language we proposed that phonological encoding does not necessarily occur in writing and that the phonemic and graphemic subsystems can be independent on the one-word level. This hypothesis was tested by comparing oral and written performance in a picture-naming task in Broca's and Wernicke's aphasics. In addition, the residual tacit knowledge of the orthographic properties of the names of the pictures was examined with a multiple-choice recognition task. The principal finding is that Broca's aphasics who were better in written than in oral naming showed more graphemically and semantically motivated errors than aphasics who were better in oral than in written naming, the latter producing more phonemically motivated errors. This result supports the dual encoding concept for writing on the singleword level, implying a direct route from the mental lexicon to the graphemic system in parallel with a route mediated by the phonemic system. Multiple-choice recognition was found to be superior to both oral and written performance in both Broca's and Wernicke's aphasics. |
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Keywords: | Requests for reprints should be addressed to Dr. H. Goodglass Psychology Service Boston Veterans Administration Medical Center 150 South Huntington Avenue Boston MA 02130. |
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