Figure 2.

Schematic for Experiment 1 showing arm displacement and EMG from a representative no obstruction (A) and obstruction (B) trial. Note that only the last ~2 s of the 30 s isometric induction contraction are shown for both trials. This is followed by relaxation of the muscle which lasted ~1.5 s in this participant. The aftercontraction then began, accompanied by involuntary movement. In the no obstruction trial (A) the arm rose unimpeded. In the obstruction trial (B) an obstacle stopped the arm at ~20°.