When competition merges people's behavior: Interdependency activates shared action representations

Previous research suggests that friendly, cooperative situations cause one to integrate a co-actor's actions into one's own action system. Departing from an interdependency perspective, we predict the activation of shared action representations even in hostile, competitive situations as a result of attending to the intentions of the co-actor. To test this, in Experiment 1 we manipulated the interdependency between actor and co-actor in a joint Simon task and observed a stronger activation of shared action representations in a cooperative as well as competitive context compared to an independent context. Experiment 2 replicated the competitive context effect on activation of shared action representations and provided additional evidence for the mediating role of attending to others' intentions by taking into account the individual tendency to attend to others intentions. Together, our findings suggest that interdependency merges people's behavior even in competitive contexts, which we argue encourage actors to attend to others' intentions. (C) 2010 Elsevier Inc. All rights reserved.