Fig. 1.

Symbolically and spatially cued reaches performed by participants in a study of one- and two-handed reaching movements. Tasks are shown in panel A. Movements (dotted arrows) were executed forward (F) or sideways (S). The movements were cued by illuminating the target circle directly (spatial cues) or by letters indicating the movement direction (symbolic cues). Participants were tested in unimanual movements (left or right hand), bimanual movements with symmetric trajectories (both forward or both sideways), and bimanual movements with asymmetric trajectories (orthogonal movements). Reaction times for all of the conditions are shown in panel B. Modified from “Goal-Selection and Movement-Related Conflict During Bimanual Reaching Movements,” by J. Diedrichsen, S. Grafton, N. Albert, E. Hazeltine, & R.B. Ivry, 2006, Cerebral Cortex, 16, p. 1730.