제 목 : Cortical substrates of dynamic social interactions 연 자 : Prof. Daeyeol Lee (Yale University)
일 시 : 2013년 10월 17일 (목) 11:00-12:30 장 소 : 아시아연구소 101동 210호 영원홀
Abstract : During repeated social interactions, decision makers adjust their strategies incrementally to approximate optimal strategies, often using simple, model-free reinforcement learning algorithms. In addition, such simple learning algorithms can be complemented by high-order strategies to evade the exploitation of their opponents. Here, we analyzed the choice behaviors of rhesus monkeys performing a biased matching pennies game against a computer. We found that the predictions of simple reinforcement learning were systematically violated following specific sequences of choices and outcomes that prompted the computer opponent's exploitative algorithm. Thus, monkeys used high-order strategies to counter the opponent’s strategies. The information about specific choice-outcome conjunctions constituting such high-order strategies were found most frequently in the dorsomedial prefrontal cortex, suggesting that this area might play an important role in implementing high-order strategies during dynamic social interactions.