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Modulation of ellipses drawing by sonification

Abstract : Most studies on the regulation of speed and trajectory during ellipse drawing have used visual feedback. We used on-line auditory feedback (sonification) to induce implicit movement changes independently from vision. The sound was produced by filtering a pink noise with a bandpass filter proportional to movement speed. The first experiment was performed in 2D. Healthy participants were asked to repetitively draw ellipses during 45 second-trials whilst maintaining a constant sonification pattern (involving pitch variations during the cycle). Perturbations were produced by modifying the slope of the mapping without informing the participants. All participants adapted spontaneously their speed: they went faster if the slope decreased and slower if it increased. Higher velocities were achieved by increasing both the frequency of the movements and the perimeter of the ellipses, but slower velocities were achieved only by decreasing the perimeter of the ellipses. The shape and the orientation of the ellipses were not significantly altered. The analysis of the speed-curvature power-law parameters showed consistent modulations of the speed gain factor, while the exponent remained stable. The second experiment was performed in 3D and showed similar results, except that the main orientation of the ellipse also varied with the changes in speed. In conclusion this study demonstrated implicit modulation of movement speed by sonification and robust stability of the ellipse geometry. Participants appeared to limit the decrease in movement frequency during slowing down in order to maintain a rhythmic and not discrete motor regimen.
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Submitted on : Friday, June 12, 2020 - 9:37:08 AM
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Éric Boyer, Frédéric Bevilacqua, Emmanuel Guigon, Sylvain Hanneton, Agnès Roby-Brami. Modulation of ellipses drawing by sonification. Experimental Brain Research, Springer Verlag, 2020, 238 (4), pp.1011-1024. ⟨10.1007/s00221-020-05770-6⟩. ⟨hal-02865868⟩

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