The Japanese journal of neuropsychology

Full Text of this Article
in Japanese PDF (931K)

ArticleTitle	A case with impairment in use of the decimal system due to cerebral infarctions after subarachnoid hemorrhage
Language	J
AuthorList	Maki Nagatomo¹⁾, Mayumi Miura¹⁾, Kaoru Matsunaga²⁾
Affiliation	¹⁾Division of Speech Therapy, Department of Rehabilitation ²⁾Department of Neurology, Kumamoto Kinoh Hospital
Publication	Japanese Journal of Neuropsychology: 25 (3), 211-220, 2009
Received	Mar 5, 2007
Accepted	Dec 18, 2008
Abstract	A 41-year-old, both handed woman developed a difficulty of number processing after bilateral frontal infarctions occurring after subarachnoid hemorrhage. She showed no impairment in addition without carrying up, subtraction without carrying down, retrieval of the multiplication table (ku-ku). She was almost normal in reading numbers aloud and choice of the verbally presented number out of the written numbers, although there were a few errors in dictation of numbers. Thus her ability of numerical transcoding was almost preserved. Concerning the conceptual knowledge of numbers, she showed no impairment in appreciation of number values (1∼9), encyclopaedic numerical knowledge of numbers and comprehension of arithmetic symbols. However, she had remarkable abnormality in composition and decomposition of numbers, alignment numbers and answers to questions about the decimal numeral system. It seems that she had dysfunction in use of the decimal system which is based upon the combination of "principle of the bottom" and "positional numeral system".
Keywords	acalculia, decimal numeral system, working memory, bilateral frontal infarctions, ambidexterity