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Visual recognition of characters. Mitsuru KAWAMURA 1 , Keizo HIRAYAMA 1 1Department of Neurology, Chiba University of Medicine pp.479-488
Published Date 1991/6/10
DOI https://doi.org/10.11477/mf.1431900149
  • Abstract
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We investigated the functional roles of the occipital, temporal and parietal lobes in visual recogni-tion of characters by examining the impairment of visual recognition of characters in cases with pure alexia, alexia with agraphia and deep dyslexia. The patterns of impairment of kanji and kana observed in these three types of reading/writing disorders shed light on the brain mechanism in visual recogni-tion of Japanese characters.

1. Pure alexia

Four pure alexic patients, two classical type cases with the splenial lesions, two non-classical type cases whose lesions were localized either in the left infero-lateral portion of posterior cornu or in the left subangular area, served as subject. The mechanism of impairment in pure alexia of both types can be explained by the disconnection syndrome where visual information about characters from the left and right occipital lobes is disrupted the route to left (dominant) angular gyrus. Most of our pure alexic cases showed reading impairment both in kanji and kana, but some cases showed selective impairment in kana (Case 1) or in kanji (Case 2) suggesting that the neurological incoming routes to the angular gyrus for kanji and kana are partially different.


Copyright © 1991, 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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