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History
- Received June 25, 2009
- Revision received February 1, 2010
- Accepted February 8, 2010
- First published March 24, 2010.
- Version of record published March 24, 2010.
Copyright & Usage
Copyright © 2010 the authors 0270-6474/10/304515-07$15.00/0
Author Information
- 1Graduate School of Education, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan, and
- 2National Institute of Information and Communications Technology, Keihanna Science City, Kyoto 619-0288, Japan
- Correspondence should be addressed to either Tsuyoshi Ikegami or Daichi Nozaki, Graduate School of Education, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, ikegami{at}p.u-tokyo.ac.jp or nozaki{at}p.u-tokyo.ac.jp
Author contributions
Disclosures
- Received June 25, 2009.
- Revision received February 1, 2010.
- Accepted February 8, 2010.
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This work was supported by KAKENHI (#20670008) and a Casio Science Promotion Foundation to D.N. We thank Yoshiharu Yamamoto and members of the Nozaki laboratory for their helpful comments.
- Correspondence should be addressed to either Tsuyoshi Ikegami or Daichi Nozaki, Graduate School of Education, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, ikegami{at}p.u-tokyo.ac.jp or nozaki{at}p.u-tokyo.ac.jp
