Goal-directed aiming: Correcting a force-specification error with the right and left hands

In 2 experiments, the authors examined manual aiming asymmetries as well as the ability of participants to adjust their aiming trajectories following an unexpected change to the inertial resistance to movement. In Experiment 1, participants (N = 11) were able to rapidly adjust their movement traject ories to conform to the new movement requirements. They were faster and mor e consistent when aiming with their right hand than with their left hand, r egardless of whether or not the movement was perturbed. In Experiment 2, pa rticipants' (N = 11) vision of the hand was manipulated so that the role of visual feedback in the corrective process could be examined. Vision had an impact not only on performance but also on the characteristics of the move ment trajectories. Manual asymmetries in aiming were associated with a righ t hand superiority during the final corrective stages of the movement.