>>> Common Drive Phenomenon- the firing rates of motor units fluctuate in unison with essentially no time delay between them, as demonstrated by a lack of phase shift in the cross-correlation functions of firing rates. This indicates that a common source acts on the motoneuron pool of all of the motor units within a muscle and to a lesser but significant extent, on its synergists and antagonists. <<<
De Luca, Carlo. Insights into the control of motor units.