Abstract
Humans move one hand with gravity and the other against gravity in bimanual steering. We have focused on gravity and bimanual operation, and investigated upper-limb motor control in steering. In this paper, we test position accuracy of each movement with or against gravity. Participants are instructed to remember target position, and then to operate to the target position blindfold under different intensity of torque characteristic. Experimental results show that position accuracy in the movement against gravity is better than that with gravity. This result indicates that bimanual steering is better in aspect of position accuracy by one hand moved against gravity and energy efficiency by the other moved with gravity.
