Fig. 2.

Vectorial representation of the coordination pattern. A: normalized weighted EMG signals from 3 muscles and its coordination pattern alignment during transition from motion to force. In gray we emphasize 3 specific times (A, B, reference). B: the coordination pattern vectors [m(t)] for these 3 specific times (A, B, reference). Measuring the alignment between vectors [θ(t)] allows us to make quantitative comparisons, the coordination pattern at time A is further away from the reference than the coordination pattern is at time B. The 3D space is defined by each of the muscles where the EMG signal was acquired.