Reading ability in a case with left posterior cerebral artery infarct: on the nature of processing deficits underlying alexia and optic aphasia.

DOI 6 Citations 28 References

Bibliographic Information

Other Title
  • 左後大脳動脈梗塞例における失読の研究　仮名失読／漢字失読／視覚失語の障害水準について

Search this article

Abstract

    Reading ability was examined in a case with left posterior cerebral artery infarct. He showed pure alexia in Kana, alexia with agraphia in Kanji, and optic aphasia. He was able to match Kanji words to pictures fairly well although unable to read aloud both of Kana and Kanji words. Experimental investigation consisted of following 7 tests; (1) discrimination between wrong letters (pseudo-letters) and true letters (2) grouping of letters according to the three types of Japanese script (Kanji, Hiragana and Katakana) (3) lexical decision test of Kana sequences (4) odd word out test of kanji words (5) sorting written Kanji words into semantic categories. (6) grouping of Kanji words on the basis of semantic association (7) maching auditorily-presented words to one of five written Kanji words.<br>    He performed well in test (1) and (2), which suggested a well preserved knowledge of letter configuration. In test (3), even without setting any time limit, he could not at all decide whether written Kana sequences were real words or not. It was presumed that an ability was lost by which Kana Words (familiar letter strings) were recognized as whole units. He performed well in test (4), (5) and (6). Therefore, he could derive a lot of semantic information from written Kanji words. In test (7), he performed well in the across-category condition in which five alternatives were belonged to different semantic categories. In the within-category conditions in which five altenatives belonged to the same semantic category, his performance was strikingly deteriorated, compared to the former conditions. This result showed that his ability to discriminate semantically simillar Kanji words was impaired.<br>    The theoretical implication of these results was discussed in relation to the dissociation of reading comprehension from oral reading which was observed in reported cases with pure alexia and to the pathogenesis of optic aphasia.

Journal

  • Higher Brain Function Research

    Higher Brain Function Research 16 (3), 284-291, 1996

    Japanese Society of Aphasiology (Renamed as Japan Society for Higher Brain Dysfunction)

Citations (6)*help

See more

References(28)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top