Excluded but not alone. Does social exclusion prevent the occurrence of a Joint Simon Effect (JSE)?

The Joint Simon Effect (JSE) is known to reflect the natural and spontaneous tendency to integrate actions from another individual into our own action system during joint action. This tendency to co-represent others' actions positively correlates with the dispositional tendency to take others' perspective. However, a quick episode of social exclusion has been shown to erase the tendency to co-represent others' actions. From a theoretical viewpoint, excluded individuals should still show signs of co-representation as ostracism tends to increase attention paid to others and Perspective Taking. In this context, this study challenges the idea that social exclusion eliminates all forms of co-representation (or JSE) by using an in-person version of the Task. We also intend to replicate findings on a positive link between Perspective Taking and the size of the JSE. To this end, participants played either an inclusive or exclusive version of the Cyberball game, then performed a joint go-nogo Simon Task. Perspective Taking was measured by using the Interpersonal Reactivity Index. By contrast to previous results, our results revealed that excluded individuals co-represented others' actions as much as included ones. However, a positive correlation between Perspective Taking and the JSE was limited to included participants. We discuss these findings in terms of methodological differences and in the light of the social exclusion literature.