The role of emotion regulation and choice repetition bias in the ultimatum game.

Social decision-making is commonly explored in the context of adult responder behaviour in the Ultimatum Game.Responder behaviour in the game has been proposed to be the consequence of two competing systems that control behaviour: an affective system, which promotes an emotional response to unfair offers; and a deliberative system, which instead encourages a rational response to maximise in-game gains.In a secondary analysis of Ultimatum Game data in children and adolescents (N = 429), the present study demonstrated that trial-level metrics of responder behaviour were reflective of a dual systems framework.However, no consistent relationship was found between responder behaviour and trait-level measures of emotion regulation.Choice history was found to influence all measures of responder behaviour in the game.These results support a dual systems account of social decision-making in children and adolescents and highlight choice repetition bias as an additional factor influencing decision-making within the Ultimatum Game.