Fredrickson, B. L., Mancuso, R. A., Branigan, C., &Tugade, M. M. (2000). The undoing effect of positive emotions. Motivation and emotion, 24(4), 237-258.
Positive emotions are hypothesized to undo the cardiovascular aftereffects of negative emotions. Study 1 tests this undoing effect. Participants (n = 170) experiencing anxiety-induced cardiovascular reactivity viewed a film that elicited (a) contentment, (b) amusement, (c) neutrality, or (d) sadness. Contentment-eliciting and amusing films produced faster cardiovascular recovery than neutral or sad films did. Participants in Study 2 (n = 185) viewed these same films ...