Imperfect Imitation Can Enhance Cooperation

Details Imperfect Imitation Can Enhance Cooperation Imperfect Imitation Can Enhance Cooperation

2009-05-06

arxiv.org/abs/0905.0869v1

Europhysics Letters 87, 48005 (2009)

Biology

Quantitative Biology

Populations and Evolution

4 pages, 4 figures

Scientific paper

10.1209/0295-5075/87/48005

The promotion of cooperation on spatial lattices is an important issue in evolutionary game theory. This effect clearly depends on the update rule: it diminishes with stochastic imitative rules whereas it increases with unconditional imitation. To study the transition between both regimes, we propose a new evolutionary rule, which stochastically combines unconditional imitation with another imitative rule. We find that, surprinsingly, in many social dilemmas this rule yields higher cooperative levels than any of the two original ones. This nontrivial effect occurs because the basic rules induce a separation of timescales in the microscopic processes at cluster interfaces. The result is robust in the space of 2x2 symmetric games, on regular lattices and on scale-free networks.

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