Two experiments are reported that focus on manipulating both the context and the spatial precision of a computer-pointing task. Single goal-directed actions are compared to dual-phase tasks, where participants are required to sequentially attain two goal locations. Results support the idea that for movements in series, movement planning, and online feedback, control can occur simultaneously. Additionally, for single-phase tasks and the final phase of dual-phase tasks, the termination requirement influences the temporal components of the movement. The effects of termination and movement context appear to hold regardless of the spatial precision of the task. This suggests that the effects of spatial precision and movement termination are independent, although both have an impact on the deceleration time for goal-directed movements.
E.A. Roy and L.E. Rohr are with the Department of Kinesiology at the University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada. P.L. Weir is with the Department of Kinesiology at the University of Windsor, Windsor, Ontario, N9B 3P4, Canada.