Who is in charge?

The left side tongue, jaw and side of face are again sore from overplaying with the movements. I am trying to search for analogies for me to use. If I did not use my left hand independently as if fused to the right wrist getting it to move would create soreness once detached. I imagine it would feel similar to the sensations I am now having. My left face and tongue were doing something my whole life but I am not sure what. My best guess is that I used it in a undifferentiated sense in subordination to the right. The new use of my left tongue, jaw and side of face feels foreign and unrefined but not any sense there is a different personality involved. It is still the same old me that seems to be in charge.