Figure 1

<p><b>a</b>. Sequence of events in a trial. At the start of each trial a fixation cross appeared in the center of the screen until participants clicked on it with the cursor of the mouse. The fixation cross was replaced by the sensible or non-sensible sentences until the response was given or until 4000 ms had expired. At response execution a 1500 ms feedback appeared. After a delay of 500 ms, the next trial was initiated. Note that stimuli are not drawn to scale. <b>b</b>. Example of the experimental setting for the Social and Joint conditions. In the Social condition (leftmost panel) the experiment sat in front of the participant and did not interact with him/her. In the Joint condition (rightmost panel) the experimenter interacted with the participant at the end task execution in order to reposition the mouse upon the starting position.