How does your brain change when you are happy?Scientific research shows that it is an extremely complicated process of chemical reaction.Human brains are classified into two categories:delighted ones or depressed ones,which is determined by the hereditary factor,also shaped modified through living attitude and daily behavior. How does your brain change when you are happy?Scientific research shows that it is an extremely complicated process of chemical reaction.Human brains are classified into two categories:delighted ones or depressed ones,which is determined by the hereditary factor,also shaped modified through living attitude and daily behavior.