title: Temporal and spatial coupling of point of gaze and hand movements in aiming.
abstract: Temporal and spatial coordination of both point of gaze (PG) and hand kinematics in a speeded aiming task toward an eccentrically positioned visual target were examined with the Optotrak 3D movement analysis system in tandem with the ASL head-mounted eye tracker. Subjects (N = 10) moved eyes, head, hand, and trunk freely. On the majority of trials, the PG pattern was a large initial saccade that undershot the target slightly, then 1 or more smaller corrective saccades to reach the target. The hand exhibited a similar pattern of first undershooting the target and then making small corrective movements. Previously (W. F. Helsen, J. L. Starkes, & M. J. Buekers, 1997), the ratio of PG and total hand response time (50%) was found to be an invariant feature of the movement. In line with those results, a striking temporal coupling was found between completion of the primary eye saccade and time to peak acceleration for the limb. Spatially, peak hand velocity coincided with completion of 50% of total movement distance. Those findings support a 2-component model of limb control.
authors.affiliation: Katholieke Universiteit Leuven.
authors.forename: W F
authors.initials: WF
authors.lastname: Helsen
authors.forename: D
authors.initials: D
authors.lastname: Elliott
authors.forename: J L
authors.initials: JL
authors.lastname: Starkes
authors.forename: K L
authors.initials: KL
authors.lastname: Ricker