Signalling boosts the evolution of cooperation in repeated group interactions

Area of Science:

• Evolutionary Game Theory
• Behavioral Ecology
• Social Systems Analysis

Background:

• Collective action and cooperation are crucial in biological and social systems.
• Cooperation mechanisms like direct reciprocity, signalling, and quorum dynamics are often studied in isolation.
• Understanding the interplay between these mechanisms is vital for explaining cooperation's prevalence.

Purpose of the Study:

• To jointly analyze direct reciprocity and signalling using an evolutionary game-theoretical model.
• To determine the evolutionary conditions favoring direct reciprocity, signalling, or their combination.
• To compare the effectiveness and robustness of signalling versus direct reciprocity in promoting cooperation.

Main Methods:

• Development and analysis of an evolutionary game-theoretical model.
• Simulation of interactions incorporating direct reciprocity and signalling mechanisms.
• Assessment of strategy selection under varying conditions, including costly signalling and memory.

Main Results:

• Signalling alone achieves higher cooperation levels and offers greater robustness against errors compared to direct reciprocity.
• Direct reciprocity strategies are often not favored when signalling is present.
• Signalling evolves universally, even when associated with costs, whereas memory in reciprocity is opportunistically used.

Conclusions:

• Signalling is a more robust and effective mechanism for promoting cooperation than direct reciprocity.
• The widespread observation of signalling across complexity levels, contrasted with limited non-human direct reciprocity, is explained.
• Evolutionary dynamics favor signalling due to its inherent robustness and efficiency in driving collective action.