Regensburg 2016 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 7: Coupled Problems in Biological Systems (Focus Session)
BP 7.4: Vortrag
Montag, 7. März 2016, 12:15–12:30, H45
Predicted error pushes pointing movements into the goal — •Karl Theodor Kalveram1,2, Tim Lauer2, Sebastian Babl2, Christina Binder2, Anna Klubertanz2, Kristin Roehr2, Elena Wicharz2, Darya Yatsevich2, and Joachim Vogt2 — 1Universitaet Duesseldorf — 2Technische Universitaet Darmstadt
Movements of a pointer connected to the forearm were perturbed by arbitrary changes of the geometry of the arm-pointer arrangement. Under discontinuous visual feedback (pointer visible only at beginning and ending of the movement), the error at the movement*s first stop was high and varied with the perturbations. Under continuous visual feedback (pointer always visible), the error remained low and was un-correlated with the perturbations. Inspection of the recorded kinematics revealed that neither negative feedback control nor feedforward control through an inverse kinematics model could explain these outcomes. The paper proposes an alternative non-linear mechanism that uses the phase relationship between observed velocity and position to predict the stop position from any interim state of the movement. This provides a prediction of the error, based on which one or several scaled force impulses can be released annihilating the error at movement end.