Schematic of the tasks.

<p>EGO task: Subjects were presented a memory cue while fixating on a central fixation cross. After an unfilled delay of 5000 ms, subjects performed an eye movement to the remembered cue position (‘memory-guided saccade’). ALLO-EGO: While fixating on a central fixation cross, subjects were presented a bar, followed by presentation of a memory cue together with the bar. After an unfilled delay of 5000 ms, the bar re-appeared and subjects performed an eye movement to the remembered cue position. ALLO: This task was identical to the ALLO-EGO task until the end of the delay. Then, the bar re-appeared at a new location. Subjects performed an eye movement to the relative position of the cue with respect to the bar (i.e. to the position of the memory cue if it had been displaced together with the bar).