Pure alexia for kana. Characterization of alexia with lesions of the inferior occipital cortex.

Pure alexia for kana. Characterization of alexia with lesions of the inferior occipital cortex. Research Abstract Details 

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Pure alexia for kana. Characterization of alexia with lesions of the inferior occipital cortex. Abstract Text:

Yasuhisa Sakurai,Yasuo Terao,Yaeko Ichikawa,Hiroshi Ohtsu,Toshimitsu Momose,Shoji Tsuji,Toru Mannen,

OBJECTIVE: To characterize reading impairments caused by lesions in the posterior occipital cortices. METHODS: We gave six patients with these lesions reading and writing tests and located a critical site for alexia using MRI and SPECT. RESULTS: The patients read three-character kana (Japanese syllabograms) nonwords, and five-character kana nonwords significantly or at a near significant level more poorly and slowly than normal subjects, whereas they read kanji (Japanese morphograms) almost correctly but more slowly. Letter-by-letter reading with a single-kana character identification impairment (in five patients), a word-length effect, kinesthetic facilitation, a lexicality effect, and minor to mild agraphia for kanji (in three patients) were observed. These deficits were characteristic of pure alexia. Alexia disappeared within a few months except in one patient who had extensive hypoperfusion in the left occipital lobe. A shared lesion was located in the left posterior fusiform/inferior occipital gyri (Area 18/19) on MRI, and there was blood flow reduction around this area on SPECT. This area coincided with the activation site for kana word covert reading in our previous study. CONCLUSIONS: These results suggest that pure alexia particularly for kana, or more generally pure alexia for letters, is caused by a lesion in the posterior inferior occipital cortex, characterized primarily by impaired kana character or letter identification, with relatively preserved kanji or word recognition.

Pure alexia for kana. Characterization of alexia with lesions of the inferior occipital cortex. Publishing Authors By Initials

Y Sakurai,Y Terao,Y Ichikawa,H Ohtsu,T Momose,S Tsuji,T Mannen,

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Pure alexia for kana. Characterization of alexia with lesions of the inferior occipital cortex. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of the neurological sciences

VOLUME: 268

Page Numbers: 48-59

Journal Abbreviation: J. Neurol. Sci.

ISSN: 0022-510X

DAY: 21

MONTH: 12

YEAR: 2007

Pure alexia for kana. Characterization of alexia with lesions of the inferior occipital cortex. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Pure alexia for kana. Characterization of alexia with lesions of the inferior occipital cortex.

AFFILIATION: Department of Neurology, Mitsui Memorial Hospital, Tokyo, Japan.

Country: Netherlands

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MEDLINETA: J Neurol Sci

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