Reaching performance observed when the sensorimotor perturbation was only provided to the left arm.

<p>A, Hand-paths from a representative subject who experienced the force field provided only to the left arm during both the bilateral and unilateral sessions. B, Mean direction errors. Every data point shown on X axis represents the average of 8 consecutive trials (cycle) across subjects (mean ± SE) when the force field was provided only to the left arm (FF to L only, black lines) or to both arms (FF to both arms, grey lines). C, Hand-paths from a representative subject who experienced the force field provided only to the left arm during both the bilateral and unilateral sessions and reached toward a single target. D, Mean direction errors. Every data point shown on X axis represents the average of 8 consecutive trials (block) across subjects (mean ± SE) in the dynamic task condition (FF to L only, black lines) or in the visuomotor task condition (VR to L only, grey lines). * P<.05.