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Normalized difference between the sum of the variances of the moments produced by the normal and by the tangential forces and the variance of the total moment produced by the digits, ΔVarM(t) = {[ΣVarMn,t(t) − VarMtot(t)]/ΣVarMn,t(t)}, computed over 12 trials during the ramp force production. Averages over 0.25-s time intervals are shown with SE bars. Values are means ± SE across external torque conditions, and subject subgroups are presented.
