What sorts of signals does the brain use to communicate sensations, thoughts and actions?

Neurons
Dendrites
Synapes which act as a relay station between neurons and action potentials. Neurotransmitters play a large role in the emotions of our brain. The Hypothalmus is the part of the brain where Neurotransmitter dopamine is housed and secreted from

Behavioral science is the study of human behaviors and how they can be influenced.  by examining patterns in behavior as well as reactions, individuals with behavioral problems can be more adequately treated, resulting in greater mental health of our society/the public.