What is the behavior of a C4 quadriplegic mouth calligrapher constant function of?

Tetsushi Nonaka^*,†

^* Research Institute of Health and Welfare, Kibi International University, Japan
^† Advanced Institute of Human Sciences, Waseda University, Japan
E-mail: tetsushi.nonaka@gmail.com

Abstract

Motor coordination of a professional C4 quadriplegic calligrapher who trained himself to use his mouth to write with brush and ink by gripping a brush between his teeth was reported. Through the analysis of movement during calligraphy, it was found that the movement variability of the head-neck system was exploited to stabilize certain relations between the brush and the paper surface (e.g., brush pressure).