Demonstration of phonological dyslexia and dysgraphia in Japanese: A case report Asako Kaneoka 1 , Haruhi Inokuchi 1 , Yasuaki Karasawa 1 , Nobuhiko Haga 1 1Rehabilitation Center, The University of Tokyo Hospital Keyword: 音韻失読 , 音韻失書 , 文字-音素変換規則 , 音韻操作障害 , phonological dyslexia , phonological dysgraphia , the phoneme-grapheme correspondence system , phonological disorders pp.342-350
Published Date 2018/12/15
DOI https://doi.org/10.11477/mf.6001200198
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 We report on a 13-year-old female Japanese patient with phonological dyslexia and dysgraphia secondary to intracranial hemorrhage and discuss the underlying mechanisms of the non-word specific reading/writing disturbances. The patient demonstrated mild anomic aphasia and writing impairment of kana (Japanese phonogram) on a comprehensive language examination given 40 days after onset. A detailed neuropsychological assessment was performed on her reading and writing performance: 1) reading and writing to dictation of basic kana characters, 2) reading and writing to dictation of words and non-words, 3) a set of phonological manipulation tasks not involving reading or writing, and 4) verbal short-term memory tasks. The patient showed 1) mild impairment in reading and writing to dictation of kana characters, suggesting a mild impairment of her phoneme-grapheme correspondence system; 2) normal writing performance of words while impaired reading and writing of non-words, indicating phonological dyslexia and dysgraphia; 3) good performance in mora segmentation tasks while significant decline in non-word repetition and mora reversal tasks; 4) limited digit span while normal performance in verbal paired-associate learning. The above-mentioned findings suggest that phonological dyslexia and dysgraphia found in this patient may have been caused by phonological disorders not limited to writing and reading functions.

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