Upward Spiral of Positive Emotions
The observation that the effects of positive emotions accumulate and compound. That is, the effects of positive emotions, broadened thinking, and positive meaning share reciprocal relations. The broadened attention and cognition triggered by positive emotions, for instance, facilitate coping with adversity, and this improvised coping will in turn predict future experiences of positive emotion. As this cycle continues, people build their psychological resilience and enhance their emotional well-being.
Fredrickson, B. L., & Joiner, T. (2002). Positive emotions trigger upward spirals toward emotional well-being. Psychological Science, 13(2), 172-175. doi: 10.1111/1467-9280.00431.