繰り返し繰り返される囚人のジレンマにおける割引と互恵

D W Stephens¹, C M McLinn, J R Stevens

¹Department of Ecology, Evolution and Behavior, University of Minnesota, 1987 Upper Buford Circle, St. Paul, MN 55108, USA. dws@forager.cbs.umn.edu

Science (New York, N.Y.)

|December 14, 2002

まとめ

ブルージャイの協力は,遅延した満足と相互の行動の両方に依存しています. 安定した協力には,時間の割引を短縮し,対戦相手の相互性が必要であり,これは以前の実験の失敗を説明している.

科学分野:

動物の行動動物の行動
進化的ゲーム理論とは
行動生態学は,行動生態学である.

背景:

Iterated Prisoner's Dilemma (IPD) は,動物の協調性を理解するための重要なモデルである.
以前の研究では,一時的なディスカウント (即時の報酬への好み) が協力関係を不安定化することを示唆しています.
動物協働におけるディスカウントと相互性の相互作用は不明である.

研究の目的:

タイムリー・ディスカウントと戦略的相互性の共同効果がブルー・ジェイズの協力に及ぼす影響を調査する.
動物における安定した協力的均衡のために,減算と相互性が必要かどうかを判断する.

主な方法:

試行錯誤によるディスコントと相互性の操作. 捕獲された青いヤギ.
IPDシナリオをシミュレートするために,コントロールされた報酬ゲーム構造を使用します.
異なる治療条件下での協力行動の量化.

主要な成果:

ディスカウントと相互性の間の相互作用効果が観察されました.
ブルージャイは,割引が減り,相手が引き返すと高い,安定した協力を示した.
協力のレベルは,割引の減少または互恵が欠けていた場合に著しく減少しました.

結論:

ブルージャイの安定した協力には,時間の割引の減少と相互の相互作用の両方が必要である.
この発見は,以前の動物研究で観察された協力の不安定さの潜在的な説明を提供します.
結果は,協力の維持における個人の意思決定 (ディスカウント) と社会的フィードバック (相互性) の両者の重要な役割を強調しています.

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