A symptomatological study of micrographia

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  • Ｍｉｃｒｏｇｒａｐｈｉａの症候学的検討

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Abstract

   We conducted a symptomatological study in six patients with micrographia to assess the effects of cues (stimul) for the purpose of obtaining hints for training methods. Five of the patients had cerebrovascular disorders and the remaining patient had parkinsonism.<br>   Micrographia was observed during open-eye/closed-eye spontaneous writing/transcription irrespective of the direction of writing. No acceleration in writing speed was seen. Assessment of the cues revealed that visual cues were more effective than auditory cues. Based on the fact that all six patients had no impairment of skilled motor behavior of the hands and fingers, micrographia is thought to he associated with the mechanism of coordination of writing behavior, not motor disorder.<br>   Three of the patients had specific symptoms : 1) dexter micrographia in a patient having a lesion in the right hemisphere, 2) bilateral micrographia in a patient having a lesion in the left hemisphere, and 3) micrographia specifically seen in the letters of a patient who showed a marked difference in writing of letters and drawing of successive figures. These findings indicate that the coordination mechanism of writing behavior works independently from motor control of figure drawing and other movements, exists in the right hemisphere, and exerts an influence on the right hand. They also suggest the possibility that patterns of writing behavior can be formed in both hands.

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