최후통첩게임 및 독재자게임을 통한 조현병 환자들의 사회적 의사결정에 관한 연구

Abstract

Objectives：Patients with schizophrenia have impairment in social cognition and function. This study aimed to compare social decision-making between healthy controls and patients with schizophrenia using ultimatum game(UG) and dictator game(DG). In addition, the purpose of this study was to identify the effect of facial expression on social decision- making. Methods：Forty patients with schizophrenia and forty healthy controls were enrolled and they played three sets of games. In one set of the game, they played the role of a responder in UG, whereas in the other sets of games, they played the role of a proposer in UG and DG. All of the participants played against computerized partners with facial expressions displaying a happy, neutral, or angry status. Acceptance rate as a responder in the UG and the amount of money offered as a proposer in UG and the DG were estimated. Results：As responders, patients showed higher acceptance rates of unfair offers than controls in UG. The proposer’s facial expression significantly influenced the acceptance rate in the control group. However, patients were not affected by the facial expression. As a proposer, participants proposed a lower offer in DG than in UG, but it did not have statistical significance in patients. Conclusion：The results of this study suggest that the patients with schizophrenia do not tend to experience negative emotions provoked by unfairness and that they are deficient in social bargaining strategies. KEY WORDS：Schizophrenia · Social decision-making · Ultimatum game · Dictator game.