Emotions and segregation in social dilemmas

International audienceNormative behavior and emotions are an important aspect of cooperative behavior. We propose a prisoner's dilemma for real payoffs with the addition into the payoff matrix of an idiosyncratic shame from deviating from a cooperative norm. With global interaction, polymorphic equilibria in which cooperators and defectors coexist may appear, depending on the distribution of emotions. In addition, global interactions produce a cooperation landscape different in nature to fixed interactions with a small number of individuals. Interaction structures may produce segregation and the appearance of cooperative zones in the absence of difference in fundamentals