The Evolution of Positive Emotions Promotes Survival

The prevailing theory here is called broaden and build. It comes from a friend and a great psychologist named barbara frederickson. She has posited that the evolutionary adaptive value of positive emotions is kind of the compliment to why we have negative emotions in times of threat, stress and attack. So basically, you can think of fight or flight as two sides of the emotional coin, one for bad times, one for good times. But all these emotions promote our survival.