Co-activity during a divisible antagonistic task, with a subject stronger than the other.

<p><i>Left</i>: trajectory of the object during the competition (green), with in red stronger subject's target position and in blue the weaker subject's one. <i>Right</i>: force profile applied by each subject during the completion of the task. The stronger subject (red) is able to force the other (blue) to follow him, which leads to non-zero terminal “co-contraction” (level of applied force is non-null at the end of the task).