Emotion is one of the biological functions that the nervous system has, whose main objective is to produce adaptive behaviors that facilitate the survival of the species. Systems, neuroendocrine and autonomic nervous, are activated in the presence of a stimulus or threatening circumstance. This activation prepares the body for fight or flight in response to that threat. Such behavioral and physiological activity triggered by the emotional brain is taken up by the conscious brain (neocortex and subcortical brain regions) and perceived as feelings.
The biological mission of emotions is protect and adapt us to environmental changes, for which, emotions focuses concentration on what is pleasurable or painful thus indicates the value of situations. It also facilitates the formation of robust and lasting memories for those stimulus or situations that have importance in our lives.