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Journal of Deaf Studies and Deaf Education Advance Access published online on November 30, 2005
The Journal of Deaf Studies and Deaf Education, doi:10.1093/deafed/enj017
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© The Author 2005. Published by Oxford University Press. All rights reserved. The online version of this article has been published under an Open Access model. Users are entitled to use, reproduce, disseminate, or display the Open Access version of this article for non-commercial purposes provided that: the original authorship is properly and fully attributed; the Journal and Oxford University Press are attributed as the original place of publication with the correct citation details given; if an article is subsequently reproduced or disseminated not in its entirety but only in part or as a derivative work this must be clearly indicated. For commercial re-use, please contact: journals.permissions@oxfordjournals.org
Received July 5, 2005
Revised October 21, 2005
Accepted October 24, 2005

Article

Neural Correlates for Numerical Processing in the Manual Mode

Nobuo Masataka 1 *, Takashi Ohnishi 2, Etsuko Imabayashi 2, Makiko Hirakata 2, and Hiroshi Matsuda 2

1 Kyoto University, The Japan Science and Technology Agency
2 National Center for Neurology and Psychiatry

* To whom correspondence should be addressed.
Nobuo Masataka, E-mail: masataka{at}pri.kyoto-u.ac.jp


  Abstract

This paper reports a study designed to examine the neuronal correlates for comprehending the signs of American Sign Language representing numerals in deaf signers who acquired Japanese Sign Language as their first language. The participants were scanned by functional magnetic resonance imaging (fMRI) twice on the day of the experiment. The results of the measurements revealed that upon learning that the signs actually have numeric meaning, a network of brain areas is activated immediately. Many of these areas have been previously implicated in numerical processing. The similar neural network of brain regions responsible for numerical processing exists on a nonlinguistical basis and works to retrieve arithmetic facts from presented linguistic material regardless of the mode of the language.


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