The spatial aspect of cooperation between the two upper extremities was investigated using a bimanual task involving drawing simultaneous zig-zag lines on a vertical surface. In 62 trials by 31 strongly right-handed subjects three performance types were identified; Type I involved alternation of dominance in sideways and vertical movement components, in Type II a constant vertical movement was superimposed upon sideways movement, and Type III showed no consistent pattern across the two hands. These performance types differed significantly on the measure of spatial coordination, with Type I having the best, and Type III the poorest. These results suggest that on this bimanual task better spatial symmetry in limb movement is achieved when both hands employ similar within-hand strategies, involving switching between vectors for all muscle groups.
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