Visual information gain and task asymmetry interact in bimanual force coordination and control |
| |
Authors: | Xiaogang Hu Karl M Newell |
| |
Institution: | (1) Department of Kinesiology, The Pennsylvania State University, 266 Rec Building, University Park, PA 16802, USA |
| |
Abstract: | This study examined the question of whether and how the influence of visual information on force coordination patterns is
dependent on the settings of a task asymmetry constraint. In a bimanual isometric force experiment, the task asymmetry was
manipulated via imposing different coefficients on the index finger forces such that the weighted sum of the finger forces
matched the target force. The environmental constraint was quantified by the visual performance error and was manipulated
through the change of visual gain (number of pixels on the screen representing the unit of force). The constraint arising
from the individual was quantified by the bilateral coupling effect (i.e., symmetric force production) between hands. The
results revealed improved performance in terms of lower variability and performance error and more complex total force structure
with higher visual gain. The influence of visual gain on the force coordination pattern, however, was found to be dependent
on the task coefficients imposed on the finger forces. Namely, the force sharing between hands became more symmetric with
high visual gain only when the right finger force had the higher coefficient, and an error-compensatory strategy was evident
with high gain only when symmetric coefficients were imposed on the two fingers. The findings support the proposition that
the motor coordination and control patterns are organized by the interactive influence of different categories of constraints
where the functional influence of the information provided is dependent on the motor output. |
| |
Keywords: | |
本文献已被 PubMed SpringerLink 等数据库收录! |
|