Fig. 1.

A. Time course of the free-choice IJA task epoch. The four target objects with red frames prompted Participant 1 to select one of the objects and to direct their gaze toward it (green allows). B. At the same time, a mirror-configured set of four objects with yellow frames was displayed to Participant 2, who was required to follow their partner’s gaze to the object (free-choice RJA task). C. Color cue for the designated IJA (dIJA) task. The participant was prompted to direct their gaze toward the red-framed object. D. Color cues for the designated RJA (dRJA) and RJA tasks were presented to the partner of a participant presented with the IJA or dIJA cue. E. Color cue for the control task (CTRL), which was presented to both participants, prompting them to direct their gaze towards the blue-framed object without regard to their partner’s gaze direction.