Information that neurons process is coded into neurotransmitters. Our brain also has a system for internal needs and values. An example of a brain system includes the limbic system, which creates a value-driven system with a focus inward on survival, emotional, and nurturing needs.
The operation of the brain includes how it interacts with the environment. External sensory impressions monitor the environment; they register on our skin or sense organs embedded in the skin. Sense organs, eyes, ears, skin, nose, tongue, are included in the sensory system.
Emotions and attention are principal processes that the body/brain uses to survive and thrive. Emotions gives a quick assessment of a situation and attention provides the neural mechanisms that focus on that which is important. There are more neural fibers that project from the brain's limbic emotional center into the logical/rational cortical center, than the reverse; therefore emotion is viewed as a powerful determinant of our behavior, impossible to separate from important activities.
Short-term memory is the initial memory that holds a few units of information for a short time, while determining their importance, before being retained in long-term memory. Memory networks need to be stimulated or the neural synapses built will revert to their original state, and we will forget. Sleeping is a time when the brain resets the memory network; some believe that dreaming helps to extend