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• Vol.46 No.11
• CLINICA NEUROL, 46: 914−916, 2006
• Vol.46 No.11 contents

The 47th Annual Meeting of the Japanese Society of Neurology

Neuroscience of cursive handwriting: A computational appraoch

Kazuyoshi Fukuzawa, Ph.D.¹⁾, Satoko Tsunoda, M.A.²⁾, Yasuharu Koike, Ph.D.³⁾ and Yasuhiro Wada, Ph.D.⁴⁾

¹⁾Waseda University
²⁾Waseda University
³⁾Tokyo Institute of Technology
⁴⁾Nagaoka University of Techology

Based on the minimum torque change model (MTCM), Wada and Kawato (1995) proposed a computational model of cursive handwriting which includes the following assumptions. The brain represents via-points that the hand passes through in a trajectory. Cursive handwriting consists of consecutive reaching movements. The via-points for handwriting are retrieved from memory during actual handwriting. Mathematically extracted via-points based on MTCM proved to be practically identical to motor primitives measured by EMG suggesting that drastic directional changes in muscle movement may be determining the location of via-points. Based on computational model, we examined the via-points in the cursive handwriting of a patient with parietal lobe involvement accompaning agraphia. While the control subject showed basically the same numbers and locations in via-points regardless of the velocity of hand movement, the patient's number and locations of via-points differed depending on the velocity of hand movement. The results suggest that the control subject retrieved necessary via-points based on the velocity of handwriting. The results also may reflect the neuropsychological nature of agraphic hand writing in a patient with parietal lobe damage.

(CLINICA NEUROL, 46: 914−916, 2006)
key words: cursive handwriting, computational theory of movement, via-point, motor primitive, agraphia

(Received: 12-May-06)