Broaden-and-Build Theory of Positive Emotion

A theory that posits that experiences of positive emotions broaden people’s momentary thought-action repertoires, which in turn serves to build their enduring personal resources, ranging from physical and intellectual resources to social and psychological resources. See also undoing effect of positive emotions. Compare with the upward spiral of lifestyle change and upward spiral of positive emotions.

The theory that proposes that when people experience positive emotions, they are more likely to think in broadened terms - they become more open to possibilities, consider more options, and then engage in actions that benefit them socially and psychologically. A person experiencing joy regularly, from say, socializing, for instance, is more open to opportunities for further social connections. This, over time, helps them form more friendships, which can benefit their well-being.

Reference:

Fredrickson, B. L. (2001). The role of positive emotions in positive psychology: The broaden-and-build theory of positive emotions. American Psychologist, 56(3), 218-226. https://psycnet.apa.org/doi/10.1037/0003-066X.56.3.218