Visuomotor transformations affect
bimanual coupling |
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Authors: | Cornelia?Weigelt Email author" target="_blank">Simone?Cardoso de
OliveiraEmail author |
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Institution: | 1.Institut für Arbeitsphysiologie,Universit?t Dortmund, Dortmund,Germany |
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Abstract: | Interactions between bimanual movements may occur at two
different levels: at a visually based level, where movement trajectories are
programmed within the visually perceived external space, and at the executional
level, through crosstalk of sensorimotor signals arising during movement
execution. In order to distinguish between these sources of interactions, we
investigated bimanual reversal movements under different conditions of visual
feedback. A visuomotor transformation dissociated movement execution from
visual appearance on a computer screen. The transformation we used made
movements of the same amplitude evoke different excursions, and made movements
of different amplitudes entail matched excursions on the screen. The
transformed conditions allowed us to study which parameters of bimanual
coupling were related to the way movements were executed and which correlated
with the visual movement display. We found a clear dissociation between
execution-related and visually related bimanual interactions. The assimilation
of movement amplitudes was completely execution-related. Whenever movements of
different amplitudes were generated, the shorter movement was lengthened,
irrespective of how the movements appeared on the feedback screen. In contrast,
temporal coordination at the point of movement reversal, as well as
trial-by-trial correlations of movement amplitudes, also showed significant
effects of the visuomotor transformation, suggesting that these parameters are
influenced by visually perceived effects of movements. This dissociation
confirms the idea of separate pathways for bimanual interactions and shows that
a specific set of bimanual interactions occur at least partly within a visually
based external reference frame.
Electronic Publication |
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Keywords: | Bimanual coordination Bimanual coupling Interlimb coordination Visuomotor transformations Internal models Motor coordination Motor learning Human |
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