Psychological Distancing: Why Happiness Helps you See the BIg Picture, Journal of Consumer Research
We propose that a positive mood, by signaling that a situation is benign, might allow people to step back and take in the big picture. As a consequence, a positive mood might increase abstract construal and the adoption of abstract, future goals. In contrast, a negative mood, by signaling not only danger but also its imminence, might focus attention on immediate and proximal concerns and reduce the adoption of abstract, future goals.
Labroo, Aparna. 2009. Psychological Distancing: Why Happiness Helps you See the BIg Picture. Journal of Consumer Research. 35(5): 800-9.