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Discrete and rhythmic movements - just a bifurcation apart?| old_uid | 13173 |
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| title | Discrete and rhythmic movements - just a bifurcation apart? |
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| start_date | 2013/12/12 |
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| schedule | 10h30-12h |
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| online | no |
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| location_info | EuroMov, salle EJM |
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| summary | Whether discrete and rhythmic movements result from the same or from separate dynamical structures is yet unclear. I will discuss a robust albeit computationally demanding approach to tackle this issue. This approach allows for identifying the generating dynamical systems on the basis of possibly non-stationary and noisy signals [1,2]. I will apply this approach to data from recent experiments in which movement tempo was systematically modified to pinpoint ‘spontaneous’ switches (aka bifurcations) from discrete to rhythmic movement and back again [3,4]. In a nutshell it appears that both movement archetypes live in the same phase space but in distinct dynamical regimes. [1] A.M. van Mourik (2006) Structure from randomness. A window into coordination. PhD thesis, VU University Amsterdam. [2] Daffertshofer, A. (2011) Benefits and Pitfalls in Analyzing Noise in Dynamical Systems – On Stochastic Dif-ferential Equations and System Identification. In R. Huys & V.K. Jirsa (eds.) Nonlinear Dynamics in Cognitive Sciences, Springer, Berlin. [3] Huys, Studenka, et al. (2008) Distinct Timing Mechanisms Produce Discrete and Continuous Movements. PLoS Computational Biology 4(4): e1000061. [4] Van Veen, Huys, Daffertshofer (in preparation) An encephalographic approach to timing mechanism in motor control. |
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| responsibles | Hoffmann, Marin |
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