Visuomotor information drives interference between the hands more than dynamic motor information during bimanual reaching
biorxiv(2021)
Abstract
During complex bimanual movements, interference can occur in the form of one hand influencing the action of the contralateral hand. Interference likely results from conflicting sensorimotor information shared between brain regions controlling hand movements via neural crosstalk. However, how visual and force-related feedback processes interact with each other during bimanual reaching is not well understood. In this study, four groups experienced either a visuomotor perturbation, dynamic perturbation, combined visuomotor and dynamic perturbation, or no perturbation in their right hand during bimanual reaches, with each hand controlling its own cursor. The left hand was examined for interference as a consequence of the right-hand perturbation. The results indicated that the visuomotor and combined perturbations showed greater interference in the left hand than the dynamic perturbation, but that the combined and visuomotor perturbations were equivalent. This suggests that dynamic sensorimotor and visuomotor processes do not interact between hemisphere-hand systems, and that primarily visuomotor processes lead to interference between the hands.
### Competing Interest Statement
The authors have declared no competing interest.
* ANOVA
: Analysis of Variance
Combo Pert
: Combined Perturbation
DYN Pert
: Dynamic Perturbation
EXP
: Exposure
FEE
: Final Endpoint Error
IDE
: Initial Directional Error
IEE
: Initial Endpoint Error
KBL
: Kinesthetic baseline
OFCT
: Optimal Feedback Control Theory
Post-EXP
: Post-exposure
RMSE
: Root mean square error
VBL
: Visual baseline
VM Pert
: Visuomotor perturbation
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