Stimuli and procedure.

<p>In the A-group, subjects (n = 12) performed one single session (400 trials) with a single offset side for 5 days. In the AB-group, subjects (n = 12) performed an additional training session B (400 trials) immediately after session A. The three-dot were identical except that the offset side in training session B was opposite to that presented in session A. For both these groups, the eye-tracker was employed with the gaze-contingent display. Note the offset side used in session A and B were counterbalanced across subjects for all experiments. The AB-gazefree group used the same paradigm as for the AB-group except that the eye-tracker was not employed.