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. Author manuscript; available in PMC: 2013 Nov 1.

Published in final edited form as: Exp Brain Res. 2012 Sep 28;223(2):159–175. doi: 10.1007/s00221-012-3235-0

Upper panel. Joint torques and the grasp moment across the target force directions (for 40% of MVC). The data are for a representative subject. Note that the grasp moment changes in the opposite directions to both joint torques (negative correlation).

Bottom panel. The joint torques multiplied by the coefficients from equation 6b: −0.29T₂ and 1.29T₃, respectively. The grasp moment changes in the same direction as the elbow joint component (−0.29T₂) and opposite to the wrist joint component (1.29T₃). This should result in the negative across tasks correlation between the T₃ and M despite their positive relation seen in equation 6.

Upper panel. Joint torques and the grasp moment across the target force directions (for 40% of MVC). The data are for a representative subject. Note that the grasp moment changes in the opposite directions to both joint torques (negative correlation).

Bottom panel. The joint torques multiplied by the coefficients from equation 6b: −0.29T₂ and 1.29T₃, respectively. The grasp moment changes in the same direction as the elbow joint component (−0.29T₂) and opposite to the wrist joint component (1.29T₃). This should result in the negative across tasks correlation between the T₃ and M despite their positive relation seen in equation 6.