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Optimization of IINTE and IINTS in the D and ND arm. The three panels demonstrate percentage of strokes (a) optimized in terms of IINTE, (b) optimized in terms of IINTS, and (c) not optimized in terms of any of the two cost functions. All three characteristics significantly depended on the arm (indicated by *) but not by the secondary task. The significant arm effect indicates that the ND arm exploited INT for joint rotation less efficiently than the D arm
