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Brain mechanisms for vocabulary Manabu Ikeda 1 , Kenjiro Komori 1 , Hirotaka Tanabe 1 1Department of Neuropsychiatry, Ehime University School of Medicine Keyword: 語彙 , semantic dementia , 表象 , 意味記憶 , 補完現象 pp.763-769
Published Date 2003/10/10
DOI https://doi.org/10.11477/mf.1431100360
  • Abstract
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 To address the brain mechanisms for vocabulary, we analyzed cognitive features in semantic dementia(SD)due to temporal lobar atrophy. SD shows selective breakdown of comprehending words, faces and objects. Patients with predominantly left temporal lobar atrophy(SD-L), characterized by“gogi aphasia”showed more marked deterioration of verbal production and comprehension compared to patients with greater abnormality on the right(SD-R). However, SD-L patients could visually identify objects. SD-L patients were profoundly impaired in word-completion priming and proverb completion task. These patterns of deficits in SD-L suggest that the store of verbal representation is severely impaired with relatively preserved semantic system and the left temporal lobe may be more important in verbal representation than the right. On the contrary, patients with SD-R showed more marked deterioration of performances in the object completion tests than SD-L patients. This suggests neural substrates of visual representation may be subserved by the right temporal lobe mainly. These deficits in SD might be the deterioration of Perceptual Representation System(PRS)which support semantic system in the Tulving's Serial-Parallel-Independent model(2001).


Copyright © 2003, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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