Phillip McGarry in The Conversation:
Psychology researcher Eli Finkel and his colleagues have suggested that moral judgment plays a major role in political polarization in the United States. My research team wondered if acts demonstrating good moral character could counteract partisan animosity. In other words, would you think more highly of someone who treated you well – regardless of their political leanings?
We decided to conduct an experiment based on game theory and turned to the Ultimatum Game, which researchers developed to study the role of fairness in cooperation. Psychology researcher Hanah Chapman and her colleagues have demonstrated that unfairness in the Ultimatum Game elicits moral disgust, making it a good tool for us to use to study moral judgment in real time.
The Ultimatum Game allowed us to experimentally manipulate whether partisans were treated unfairly, fairly or even kindly by political opponents. Participants had no knowledge about the person they were playing with beyond party affiliation and how they played the game.
More here.