Figure 1.
Schematic of the experimental tasks, showing compatible (left panel) and incompatible trials (right panel), for the Single Task (top) and the Joint Task (bottom) from the perspective of the red participant.
In the top Single Task boxes no Simon Effect occurs (compatible and incompatible responses are equally fast), but in the bottom ‘Joint Task’ boxes there is a Social Simon Effect (a slowing of reactions to incompatible stimuli and a speeding of reactions to compatible stimuli).
Figure 2.
Representative illustration of a ‘Dot Estimation Task’ picture.
Figure 3.
Participant reaction times (means ±SE) on the Joint Task in the Out-group (left panel) and In-group (right panel) conditions as a function of competition and compatibility.
Figure 4.
Participant reaction times (means ±SE) on the Single Task in the Out-group (left panel) and In-group (right panel) conditions, as a function of competition and compatibility.
Table 1.
Means of the three reliable subscales as a function of group membership (in the left two columns) and competition (in two right columns).