All behavior is a form of communication. This is especially true for children that do not yet possess the skills to cope or the words to communicate what they are feeling. According to Dr. Becky Bailey (Conscious Discipline), there are three brain states: survival (brain stem), emotional (limbic system), and executive (prefrontal lobes). These three levels help explain children's behavior and a new perspective on how to assess what the child needs/wants. We also must be conscious of our internal states to help our children understand their own on their way to a (new) external behavior. Here is some information on each state.
Survival State (Bailey 38):
Emotional State (Bailey 45):
Executive State (Bailey 54)