Functional synchronization in repetitive bimanual prehension movements |
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Authors: | Email author" target="_blank">Marianne?I?ChristelEmail author Marc?Jeannerod Peter?H?Weiss |
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Institution: | 1.Biologie, Humanbiologie,Freie Universit?t Berlin,Berlin,Germany;2.Institut des Sciences Cognitives,Bron,France;3.Kognitive Neurologie, Klinik und Poliklinik für Neurologie, Uniklinik K?ln,K?ln,Germany;4.Kognitive Neurologie (INM-3), Forschungszentrum Jülich,Jülich,Germany |
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Abstract: | To examine the mechanisms of functional bimanual synchronization in goal-directed movements, we studied the movement kinematics
of motorically unimpaired subjects while they performed repetitive prehension movements (either unimanually or bimanually)
to small food items. Compared to unimanual conditions, bimanual movement execution yielded a significantly prolonged mouth
contact phase. We hypothesized that this threefold prolongation led to a proper functional synchronization of the movement
onsets of both hands at the beginning of each new movement cycle. That these temporal adjustments occurred in the movement
phase with maximal haptic input points to the importance of sensory feedback for bimanual coordination. These results are
discussed with respect to the important role of sensory feedback in the timing of coordinated bimanual movements. Furthermore,
we propose that time-based coordinating schemas, which are implemented by the cerebellum and the posterior parietal cortex using sensory feedback, underlie functional inter-limb
coordination. |
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