Self-control by pigeons in the prisoner's dilemma

Area of Science:

• Animal behavior
• Cognitive science
• Game theory

Background:

• The prisoner's dilemma game models strategic decision-making.
• In repeated games, long-term cooperation can be more beneficial than short-term defection.
• Pigeons typically exhibit short-sighted defection in this game.

Purpose of the Study:

• To investigate if pigeons can learn to cooperate in a repeated prisoner's dilemma game.
• To determine the effect of feedback signals on cooperative behavior in pigeons.
• To examine the influence of intertrial intervals on cooperation in pigeons.

Main Methods:

• Pigeons played a repeated prisoner's dilemma game against a computer.
• The computer's strategy mirrored the pigeon's previous choice (cooperate/defect).
• A signal correlated with the pigeon's choice was introduced, and intertrial intervals were manipulated.

Main Results:

• Pigeons normally defected when immediate rewards favored defection.
• Some pigeons learned to cooperate when provided with a signal linked to their prior choice.
• Cooperation rates were higher with shorter intertrial intervals compared to longer ones.

Conclusions:

• Pigeons can learn conditional cooperation strategies in the prisoner's dilemma.
• Feedback signaling past actions can promote cooperation in pigeons.
• Temporal proximity of trials influences the emergence of cooperative behavior in pigeons.