Asymmetric interlimb transfer of concurrent adaptation to opposing dynamic forces |
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Authors: | J M Galea R C Miall D G Woolley |
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Institution: | (1) Behavioural Brain Sciences Centre, School of Psychology, University of Birmingham, Edgbaston, Birmingham, West Midlands, B15 2TT, UK;(2) Perception and Motor Systems Laboratory, The University of Queensland, Brisbane, QLD, 4072, Australia |
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Abstract: | Interlimb transfer of a novel dynamic force has been well documented. It has also been shown that unimanual adaptation to
opposing novel environments is possible if they are associated with different workspaces. The main aim of this study was to
test if adaptation to opposing velocity dependent viscous forces with one arm could improve the initial performance of the
other arm. The study also examined whether this interlimb transfer occurred across an extrinsic, spatial, coordinative system
or an intrinsic, joint based, coordinative system. Subjects initially adapted to opposing viscous forces separated by target
location. Our measure of performance was the correlation between the speed profiles of each movement within a force condition
and an ‘average’ trajectory within null force conditions. Adaptation to the opposing forces was seen during initial acquisition
with a significantly improved coefficient in epoch eight compared to epoch one. We then tested interlimb transfer from the
dominant to non-dominant arm (D → ND) and vice-versa (ND → D) across either an extrinsic or intrinsic coordinative system.
Interlimb transfer was only seen from the dominant to the non-dominant limb across an intrinsic coordinative system. These
results support previous studies involving adaptation to a single dynamic force but also indicate that interlimb transfer
of multiple opposing states is possible. This suggests that the information available at the level of representation allowing
interlimb transfer can be more intricate than a general movement goal or a single perceived directional error. |
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