ウラノ　マサヨ   浦野　雅世    所属   医療保健学部 リハビリテーション学科　言語聴覚学専攻    職種   准教授
言語種別	英語
発行・発表の年月	2009/01
形態種別	学術論文
査読	査読あり
標題	Dissociation of exact and approximate calculation insevere global aphasia.
執筆形態	共著
掲載誌名	Open Neurology Journal
掲載区分	国外
出版社・発行元	The Open Neurology Journal
巻・号・頁	3,pp.8-12
総ページ数	5
担当範囲	Data collection, clinical assessment, interpretation of results, and manuscript writing
担当区分	筆頭著者
著者・共著者	Urano M, Yoshino M, Yamamoto M, and Mimura M.
概要	We report a 68-year-old patient with severe global aphasia secondary to a large left hemisphere infarction including the parietal lobe. In addition to language and neuroradiological evaluation, the patient was given specifically designed arithmetic and clock tasks requiring either exact calculation or approximate calculation. Despite severe language impairment, the patient showed relatively well-preserved abilities for numerical comprehension and arithmetic operations. Further analyses using specifically designed arithmetic and clock tasks demonstrated a clear dissociation of the patient’s abilities between impaired exact calculation and well-preserved approximate calculation. The results support the notion that numerical and arithmetic abilities are heterogeneous in that rote verbal arithmetic facts and quantitative numerical knowledge can be separable. Implications of the present findings for neural correlates of numerical and arithmetic processing suggest that the right hemisphere plays a crucial role in approximate calculation.