Variability of pen-tip displacements and joint excursions in spatially and temporally constrained drawing
Singapore : NTU
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InLeedham, G.; Leung, M.; Sagar, V. (ed.), IGS'99: Proceedings of the 9th Biennial Conference of the International Graphonomics Society, pp. 19-24
Article in monograph or in proceedings
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Leedham, G.; Leung, M.; Sagar, V. (ed.), IGS'99: Proceedings of the 9th Biennial Conference of the International Graphonomics Society
SubjectIGS'99: Proceedings of the 9th Biennial Conference of the International Graphonomics Society; Action, intention, and motor control
The variability of pen-tip displacements and joint excursions in temporally constrained ellipse drawing and loop writing was studied using a new 3D recording and analysis technique. Twelve subjects were asked to copy loop patterns varying in height between 3 and 15 mm. The patterns were projected onto the writing surface together with a moving cursor. Additionally, an acoustic pacing signal accompanied the moving cursor. These signals varied in frequency between 1 and 5 Hz. Subjects were instructed to synchronize their pen-tip displacements with both the moving cursor and the acoustic pacing signal. Although subjects generally were capable of producing pen-tip displacements at movement frequencies up to 5 Hz, externally-paced loop writing was shown to be most stable at 3 Hz, particularly at the level of the wrist joint.
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