"Such a reaction of the people restore peace of mind. I think this happens when a person is overloaded by strong positive emotions, and in this way people recover quickly from such emotions »
blockquote> In the report, published in the journal Psychological Science, shows the various examples of negative reactions to positive developments, such as the tears of his wife during a meeting with her husband, a soldier, tears teenage girls at a concert of Justin Bieber, and so on. < br />
It also provides some evidence that the strong negative feelings can trigger positive reactions. For example, the nervous laughter often arises when people are faced with very difficult or frightening situations. And yet people are known to psychologists, smiling at moments of extreme sadness.
via factroom.ru