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| Research article summary (published Dec 2002): |
Visuomotor transformations affect bimanual coupling.
Full 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.
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Author information
Author/s: Weigelt, Cornelia (C); Cardoso de Oliveira, Simone (S);
Affiliation: Institut für Arbeitsphysiologie, Universität Dortmund, Ardeystr 67, 44139, Dortmund, Germany.
Journal and publication information
Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't
Journal: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale (Exp Brain Res), published in Germany. (Language: eng)
Reference: 2003-Feb; vol 148 (issue 4) : pp 439-50
Dates: Created 2003/02/12; Completed 2003/04/28; Revised 2008/02/15;
PMID: 12582827, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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