How might joy and contentment have an "undoing" potential for negative emotions?

Question

Quizplus · Accepted Answer

Joy and contentment can act as antidotes to negative emotions by providing a positive emotional experience that can counteract negative emotions. For example, if someone is feeling angry or anxious, experiencing joy or contentment can help to reduce those negative emotions and promote more positive feelings. This is consistent with research suggesting that positive emotions can have a "broadening and building" effect, in which they help to broaden people's thoughts and actions and build resources that can buffer against stress and negative emotions.

How Might Joy and Contentment Have an "Undoing" Potential for Negative