Answer:
The answer is temperament.
Step-by-step explanation:
Temperament consists of the differences in behavior related to a person. These differences are biological and they are not related to learning, a system of values or attitudes. Some researchers make a relationship between temperament and some dynamic characteristics concerning behavior. It includes energetic aspects, plasticity, as well as emotionality.
Temperament traits like Neuroticism or Sociability are usually studied in children. Temperament is mainly related to children but some researches have shown that it is something common concerning lifespan.