Fig. 7

Grip force trajectory by object weight. a Non-amputee c Amputee participant. Solid lines represent the mean of all successful (no-slip) trials in the first two block (trials 1–72). Shading represents the 95 % confidence intervals of the mean. Brown traces represent the light object and orange traces represent the heavy object. The mean grip force for each weight just before lift-off GripT-10 is shown in the accompanying bar plots:b non-amputee, d Amputee participants. Error bars represent 1 standard error