The title, which is the Association for Psychological Science's press release title, pretty much says it all. More specifically, "Angry people spent more time looking at the rewarding pictures."
The implication for child development is that parents (or teachers) who are faced with an angry child (or teenager) are more likely to calm her down if you offer her something than if you threaten to take something away. It sounds like appeasement.
Crap. Time to get ready for work again. Gainful employment can be satisfying, but it cuts into so many other things.