Evaluating the coordination dynamics of handwriting |
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Authors: | Athènes Sylvie Sallagoïty Isabelle Zanone Pier-Giorgio Albaret Jean-Michel |
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Institution: | Centre d'Etudes de la Navigation Aérienne, 7 Avenue Edouard Belin, BP 4005, 31005 Toulouse Cedex, France. athenes@cena.fr |
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Abstract: | This study aims to test the hypothesis that handwriting is governed by the dynamics of non-linear coupled oscillators. Accordingly, its first goal is to identify preferred, basic graphic shapes corresponding to spontaneously stable combinations of the two frequency-locked oscillatory x-y components of the trajectories. Six participants were required to produce 26 ellipsoids of varying eccentricities and orientations presented consecutively on a graphic tablet. These shapes corresponded to a systematic manipulation of the relative phase and the relative amplitude of the oscillators by a constant step. Results showed that among those, only eight ellipsoids were produced in a spontaneous and stable fashion. They were characterized by attraction of nearby shapes, and by a higher accuracy and velocity. Alike all periodic motion, graphic skills, hence handwriting, exhibit preferred coordination patterns, which can be ascribed to the non-linear coupling of two oscillators. |
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