2011年6月8日水曜日

Neural basis of conditional cooperation

Shinsuke Suzuki, Kazuhisa Niki, Syoken Fujisaki and Eizo Akiyama
Social Cognitive & Affective Neurosci
Volume 6, Issue 3 Pp. 338-347

自分の論文なので一応宣伝。

互恵的協力行動についてのfMRI実験。
参加者はfMRI中で囚人のジレンマゲーム(ランダム・マッチングの繰り返しゲーム)を行う。

行動データ:参加者は「基本的には協力するが、裏切り者(過去のゲームで裏切った回数の多い人)には裏切る」という傾向を持つ。
fMRIデータ:「裏切り者に対して裏切る」とき、dlPFC(前頭前野外背側部)が活動。
→ 互恵性(しっぺ返しやトリガー戦略)の神経科学的基盤


Cooperation among genetically unrelated individuals is a fundamental aspect of society, but it has been a longstanding puzzle in biological and social sciences. Recently, theoretical studies in biology and economics showed that conditional cooperation?cooperating only with those who have exhibited cooperative behavior?can spread over a society. Furthermore, experimental studies in psychology demonstrated that people are actually conditional cooperators. In this study, we used functional magnetic resonance imaging to investigate the neural system underlying conditional cooperation by scanning participants during interaction with cooperative, neutral and non-cooperative opponents in prisoner's dilemma games. The results showed that: (i) participants cooperated more frequently with both cooperative and neutral opponents than with non-cooperative opponents; and (ii) a brain area related to cognitive inhibition of pre-potent responses (right dorsolateral prefrontal cortex) showed greater activation, especially when participants confronted non-cooperative opponents. Consequently, we suggest that cognitive inhibition of the motivation to cooperate with non-cooperators drives the conditional behavior.

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