Figure 4

Sample hand kinematics of the complex sequences in which the Jab was embedded: Conservation vs. non-conservation of trajectories according to changes in body dynamics (speeds and loads). (A) The intended Uppercut motions U1 performed at different speeds maintain the curvature of the trajectories despite the changes in body dynamics. (B) In marked contrast the speed changes separate the curvatures of the spontaneous retracting segments, measured through a simple linearity metric (see Methods). (C)-(D) Similar behavior was registered for the Hook under speed and loads condition. Notice that the addition of loads makes the linearity more variable.