What other aspects of facial movement besides the muscles are important?

With the addition of motion and time to the record, additional aspects of muscular action can be scored. The table below shows the important aspects of facial muscular action that need to be measured.

In addition to the specific muscular action, an action's intensity, temporal course, and asymmetry can be measured. In regard to intensity, the rates of contraction and relaxation of the muscle, as well as the absolute level of contraction at the maximum excursion of the muscle, or apex, can be measured.