Neural network theory of language and clinical course of aphasia Sumio Ishiai 1 1Department of Rehabilitation Medicine, Sapporo Medical University School of Medicine Keyword: 言語 , 失語症 , 神経ネットワーク , 臨床経過 , 病巣研究 , language , aphasia , neural network , clinical course , lesion study pp.9-19
Published Date 2019/3/15
DOI https://doi.org/10.11477/mf.6001200209
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 The approach of neuropsychology, which aims at investigating the relationship between brain and cognitive functions such as language, has changed from the classical localization theory into the neural network theory. The recent progress in diagnostic imaging has made it possible to reveal detailed lesion sites in the normalized human brain, functional sites activated by specific cognitive tasks, and neural tracts running in the brain white matter. The present review deals with neuropsychological considerations on language and its disturbances or aphasia. The neural network theory of language may not always explain clinical aphasic signs according to the damaged site in that network. An acute localized lesion may impair not only the function of its corresponding part of the language network but also the functions of the surrounding network through the white matter connections. In the course of recovery, the neural plasticity and the redundancy of the white matter connections may contribute to reconstructing the network of language. We should revisit great number of lesion studies accumulated so far and sophisticate neuropsychological approaches based on the neural network theory of the cognitive functions.

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電子版ISSN 印刷版ISSN 1349-5828 日本言語聴覚士協会